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C $Header: /u/gcmpack/MITgcm/pkg/fizhi/fizhi_swrad.F,v 1.2 2004/06/15 16:06:03 molod Exp $ |
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C $Name: $ |
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|
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#include "CPP_OPTIONS.h" |
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subroutine swrio (nymd,nhms,ndswr,myid,istrip,npcs, |
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. pz,tz,qz,pkht,oz,co2, |
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. albvisdr,albvisdf,albnirdr,albnirdf, |
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. dtradsw,dtswclr,radswg,swgclr, |
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. fdifpar,fdirpar,osr,osrclr, |
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. im,jm,lm,sige,sig,dsig,ptop, |
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. nswcld,cldsw,cswmo,nswlz,swlz, |
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. lpnt,imstturb,qliqave,fccave,landtype,xlats,xlons) |
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|
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implicit none |
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#ifdef ALLOW_DIAGNOSTICS |
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#include "diagnostics.h" |
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#endif |
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|
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c Input Variables |
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c --------------- |
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integer nymd,nhms,ndswr,istrip,npcs |
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|
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integer im,jm,lm |
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real ptop |
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real sige(lm+1) |
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real sig(lm) |
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real dsig(lm) |
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|
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real pz(im,jm) |
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real tz(im,jm,lm) |
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real pkht(im,jm,lm) |
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|
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real co2 |
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real oz(im,jm,lm) |
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real qz(im,jm,lm) |
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|
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real albvisdr(im,jm) |
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real albvisdf(im,jm) |
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real albnirdr(im,jm) |
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real albnirdf(im,jm) |
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|
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real radswg(im,jm) |
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real swgclr(im,jm) |
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real fdifpar(im,jm) |
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real fdirpar(im,jm) |
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real osr(im,jm) |
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real osrclr(im,jm) |
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real dtradsw(im,jm,lm) |
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real dtswclr(im,jm,lm) |
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|
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integer nswcld,nswlz |
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real cldsw(im,jm,lm) |
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real cswmo(im,jm,lm) |
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real swlz(im,jm,lm) |
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|
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logical lpnt |
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integer imstturb |
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real qliqave(im,jm,lm) |
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real fccave(im,jm,lm) |
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|
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integer landtype(im,jm) |
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|
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c Local Variables |
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c --------------- |
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integer i,j,L,nn,nsecf,mid_level, low_level |
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integer nb2,ntmstp,nymd2,nhms2 |
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real getcon,grav,cp,undef,pcheck |
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real ra,alf,reffw,reffi,tminv |
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|
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parameter ( reffw = 10.0 ) |
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parameter ( reffi = 65.0 ) |
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|
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real alat(im,jm) |
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real alon(im,jm) |
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|
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real PKZ(im,jm,lm) |
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real PLZ(im,jm,lm) |
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real tdry(im,jm,lm) |
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real PLZE(im,jm,lm+1) |
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real TEMP1(im,jm) |
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real TEMP2(im,jm) |
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real zenith (im,jm) |
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real cldtot (im,jm,lm) |
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real cldmxo (im,jm,lm) |
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real totcld (im,jm) |
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real cldlow (im,jm) |
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real cldmid (im,jm) |
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real cldhi (im,jm) |
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real taulow (im,jm) |
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real taumid (im,jm) |
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real tauhi (im,jm) |
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real tautype(im,jm,lm,3) |
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real tau (im,jm,lm) |
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real albedo(im,jm) |
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|
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real PK(ISTRIP,lm) |
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real qzl(ISTRIP,lm), CLRO(ISTRIP,lm) |
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real TZL(ISTRIP,lm) |
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real OZL(ISTRIP,lm) |
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real PLE(ISTRIP,lm+1) |
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real COSZ(ISTRIP) |
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|
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real albuvdr(ISTRIP),albuvdf(ISTRIP) |
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real albirdr(ISTRIP),albirdf(ISTRIP) |
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real difpar (ISTRIP),dirpar (ISTRIP) |
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|
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real fdirir(istrip),fdifir(istrip) |
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real fdiruv(istrip),fdifuv(istrip) |
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|
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real flux (istrip,lm+1) |
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real fluxclr(istrip,lm+1) |
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real dtsw (istrip,lm) |
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real dtswc (istrip,lm) |
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|
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real taul (istrip,lm) |
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real reff (istrip,lm,2) |
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real tauc (istrip,lm,2) |
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real taua (istrip,lm) |
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real tstrip (istrip) |
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|
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logical first |
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data first /.true./ |
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|
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integer koz, kh2o |
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data KOZ /20/ |
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data kh2o /18/ |
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|
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C ********************************************************************** |
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C **** INITIALIZATION **** |
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C ********************************************************************** |
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|
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grav = getcon('GRAVITY') |
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cp = getcon('CP') |
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undef = getcon('UNDEF') |
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|
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NTMSTP = nsecf(NDSWR) |
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TMINV = 1./float(ntmstp) |
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|
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do j = 1,jm |
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do i = 1,im |
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PLZE(I,j,1) = SIGE(1)*PZ(I,j) + PTOP |
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enddo |
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enddo |
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|
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DO L = 1,lm |
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do j = 1,jm |
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DO I = 1,im |
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PLZ (I,j,L ) = SIG (L) *PZ(I,j) + PTOP |
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PLZE(I,j,L+1) = SIGE(L+1)*PZ(I,j) + PTOP |
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ENDDO |
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ENDDO |
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ENDDO |
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|
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call pkappa ( pz,pkht,pkz,ptop,sige,dsig,im,jm,lm ) |
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|
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C Compute Temperature from Theta |
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C ------------------------------ |
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do L=1,lm |
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do j=1,jm |
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do i=1,im |
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tdry(i,j,L) = tz(i,j,L)*pkz(i,j,L) |
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enddo |
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enddo |
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enddo |
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|
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c Determine Level Indices for Low-Mid-High Cloud Regions |
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c ------------------------------------------------------ |
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low_level = lm |
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mid_level = lm |
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do L = lm-1,1,-1 |
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pcheck = (1000.-ptop)*sig(l) + ptop |
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if (pcheck.gt.700.0) low_level = L |
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if (pcheck.gt.400.0) mid_level = L |
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enddo |
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|
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if (first .and. myid.eq.0 ) then |
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print * |
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print *,'Low-Level Clouds are Grouped between levels: ', |
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. lm,' and ',low_level |
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print *,'Mid-Level Clouds are Grouped between levels: ', |
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. low_level-1,' and ',mid_level |
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print * |
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first = .false. |
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endif |
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|
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C ********************************************************************** |
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C **** CALCULATE COSINE OF THE ZENITH ANGLE **** |
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C ********************************************************************** |
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|
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CALL ASTRO ( NYMD, NHMS, ALAT,ALON, im*jm, TEMP1,RA ) |
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NYMD2 = NYMD |
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NHMS2 = NHMS |
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CALL TICK ( NYMD2, NHMS2, NTMSTP ) |
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CALL ASTRO ( NYMD2, NHMS2, ALAT,ALON, im*jm, TEMP2,RA ) |
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|
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do j = 1,jm |
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do i = 1,im |
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zenith(I,j) = TEMP1(I,j) + TEMP2(I,j) |
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IF( zenith(I,j) .GT. 0.0 ) THEN |
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zenith(I,j) = (2./3.)*( zenith(I,j)-TEMP2(I,j)*TEMP1(I,j) |
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. / zenith(I,j) ) |
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ENDIF |
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ENDDO |
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ENDDO |
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|
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|
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C ********************************************************************** |
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c **** Compute Two-Dimension Total Cloud Fraction (0-1) **** |
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C ********************************************************************** |
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|
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c Initialize Clear Sky Probability for Low, Mid, and High Clouds |
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c -------------------------------------------------------------- |
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do j =1,jm |
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do i =1,im |
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cldlow(i,j) = 0.0 |
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cldmid(i,j) = 0.0 |
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cldhi (i,j) = 0.0 |
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enddo |
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enddo |
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|
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c Adjust cloud fractions and cloud liquid water due to moist turbulence |
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c --------------------------------------------------------------------- |
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if(imstturb.ne.0) then |
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do L =1,lm |
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do j =1,jm |
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do i =1,im |
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cldtot(i,j,L)=min(1.0,max(cldsw(i,j,L),fccave(i,j,L)/imstturb)) |
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cldmxo(i,j,L)=min(1.0,cswmo(i,j,L)) |
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swlz(i,j,L)=swlz(i,j,L)+qliqave(i,j,L)/imstturb |
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enddo |
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enddo |
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enddo |
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else |
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do L =1,lm |
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do j =1,jm |
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do i =1,im |
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cldtot(i,j,L) = min( 1.0,cldsw(i,j,L) ) |
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cldmxo(i,j,L) = min( 1.0,cswmo(i,j,L) ) |
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enddo |
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enddo |
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enddo |
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endif |
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|
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c Compute 3-D Cloud Fractions |
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c --------------------------- |
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if( nswcld.ne.0 ) then |
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do L = 1,lm |
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do j = 1,jm |
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do i = 1,im |
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c Compute Low-Mid-High Maximum Overlap Cloud Fractions |
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c ---------------------------------------------------- |
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if( L.lt.mid_level ) then |
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cldhi (i,j) = max( cldtot(i,j,L),cldhi (i,j) ) |
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elseif( L.ge.mid_level .and. |
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. L.lt.low_level ) then |
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cldmid(i,j) = max( cldtot(i,j,L),cldmid(i,j) ) |
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elseif( L.ge.low_level ) then |
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cldlow(i,j) = max( cldtot(i,j,L),cldlow(i,j) ) |
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endif |
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|
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enddo |
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enddo |
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enddo |
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endif |
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|
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c Totcld => Product of Clear Sky Probabilities for Low, Mid, and High Clouds |
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c -------------------------------------------------------------------------- |
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do j = 1,jm |
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do i = 1,im |
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totcld(i,j) = 1.0 - (1.-cldhi (i,j)) |
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. * (1.-cldmid(i,j)) |
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. * (1.-cldlow(i,j)) |
273 |
enddo |
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enddo |
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|
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c Compute Cloud Diagnostics |
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c ------------------------- |
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if(icldfrc.gt.0) then |
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do j=1,jm |
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do i=1,im |
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qdiag(i,j,icldfrc) = qdiag(i,j,icldfrc) + totcld(i,j) |
282 |
enddo |
283 |
enddo |
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ncldfrc = ncldfrc + 1 |
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endif |
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|
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if( icldras.gt.0 ) then |
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do L=1,lm |
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do j=1,jm |
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do i=1,im |
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qdiag(i,j,icldras+L-1) = qdiag(i,j,icldras+L-1) + cswmo(i,j,L) |
292 |
enddo |
293 |
enddo |
294 |
enddo |
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ncldras = ncldras + 1 |
296 |
endif |
297 |
|
298 |
if( icldtot.gt.0 ) then |
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do L=1,lm |
300 |
do j=1,jm |
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do i=1,im |
302 |
qdiag(i,j,icldtot+L-1) = qdiag(i,j,icldtot+L-1) + cldtot(i,j,L) |
303 |
enddo |
304 |
enddo |
305 |
enddo |
306 |
ncldtot = ncldtot + 1 |
307 |
endif |
308 |
|
309 |
if( icldlow.gt.0 ) then |
310 |
do j=1,jm |
311 |
do i=1,im |
312 |
qdiag(i,j,icldlow) = qdiag(i,j,icldlow) + cldlow(i,j) |
313 |
enddo |
314 |
enddo |
315 |
ncldlow = ncldlow + 1 |
316 |
endif |
317 |
|
318 |
if( icldmid.gt.0 ) then |
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do j=1,jm |
320 |
do i=1,im |
321 |
qdiag(i,j,icldmid) = qdiag(i,j,icldmid) + cldmid(i,j) |
322 |
enddo |
323 |
enddo |
324 |
ncldmid = ncldmid + 1 |
325 |
endif |
326 |
|
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if( icldhi.gt.0 ) then |
328 |
do j=1,jm |
329 |
do i=1,im |
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qdiag(i,j,icldhi) = qdiag(i,j,icldhi) + cldhi(i,j) |
331 |
enddo |
332 |
enddo |
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ncldhi = ncldhi + 1 |
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endif |
335 |
|
336 |
if( ilzrad.gt.0 ) then |
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do L=1,lm |
338 |
do j=1,jm |
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do i=1,im |
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qdiag(i,j,ilzrad+L-1) = qdiag(i,j,ilzrad+L-1) + swlz(i,j,L)*1.0e6 |
341 |
enddo |
342 |
enddo |
343 |
enddo |
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nlzrad = nlzrad + 1 |
345 |
endif |
346 |
|
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c Albedo Diagnostics |
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c ------------------ |
349 |
if( ialbvisdr.gt.0 ) then |
350 |
do j=1,jm |
351 |
do i=1,im |
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qdiag(i,j,ialbvisdr) = qdiag(i,j,ialbvisdr) + albvisdr(i,j) |
353 |
enddo |
354 |
enddo |
355 |
nalbvisdr = nalbvisdr + 1 |
356 |
endif |
357 |
|
358 |
if( ialbvisdf.gt.0 ) then |
359 |
do j=1,jm |
360 |
do i=1,im |
361 |
qdiag(i,j,ialbvisdf) = qdiag(i,j,ialbvisdf) + albvisdf(i,j) |
362 |
enddo |
363 |
enddo |
364 |
nalbvisdf = nalbvisdf + 1 |
365 |
endif |
366 |
|
367 |
if( ialbnirdr.gt.0 ) then |
368 |
do j=1,jm |
369 |
do i=1,im |
370 |
qdiag(i,j,ialbnirdr) = qdiag(i,j,ialbnirdr) + albnirdr(i,j) |
371 |
enddo |
372 |
enddo |
373 |
nalbnirdr = nalbnirdr + 1 |
374 |
endif |
375 |
|
376 |
if( ialbnirdf.gt.0 ) then |
377 |
do j=1,jm |
378 |
do i=1,im |
379 |
qdiag(i,j,ialbnirdf) = qdiag(i,j,ialbnirdf) + albnirdf(i,j) |
380 |
enddo |
381 |
enddo |
382 |
nalbnirdf = nalbnirdf + 1 |
383 |
endif |
384 |
|
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C Compute Optical Thicknesses and Diagnostics |
386 |
C ------------------------------------------- |
387 |
call opthk(tdry,plz,plze,swlz,cldtot,cldmxo,landtype,im,jm,lm, |
388 |
. tautype) |
389 |
|
390 |
do L = 1,lm |
391 |
do j = 1,jm |
392 |
do i = 1,im |
393 |
tau(i,j,L) = tautype(i,j,L,1)+tautype(i,j,L,2)+tautype(i,j,L,3) |
394 |
enddo |
395 |
enddo |
396 |
enddo |
397 |
|
398 |
if( itauave.gt.0 ) then |
399 |
do L=1,lm |
400 |
do j=1,jm |
401 |
do i=1,im |
402 |
qdiag(i,j,itauave+L-1) = qdiag(i,j,itauave+L-1) + |
403 |
. tau(i,j,L)*100/(plze(i,j,L+1)-plze(i,j,L)) |
404 |
enddo |
405 |
enddo |
406 |
enddo |
407 |
ntauave = ntauave + 1 |
408 |
endif |
409 |
|
410 |
if( itaucld.gt.0 ) then |
411 |
do L=1,lm |
412 |
do j=1,jm |
413 |
do i=1,im |
414 |
if( cldtot(i,j,L).ne.0.0 ) then |
415 |
qdiag(i,j,itaucld +L-1) = qdiag(i,j,itaucld +L-1) + |
416 |
. tau(i,j,L)*100/(plze(i,j,L+1)-plze(i,j,L)) |
417 |
qdiag(i,j,itaucldc+L-1) = qdiag(i,j,itaucldc+L-1) + 1.0 |
418 |
endif |
419 |
enddo |
420 |
enddo |
421 |
enddo |
422 |
endif |
423 |
|
424 |
c Compute Low, Mid, and High Cloud Optical Depth Diagnostics |
425 |
c ---------------------------------------------------------- |
426 |
if( itaulow.ne.0 ) then |
427 |
do j = 1,jm |
428 |
do i = 1,im |
429 |
if( cldlow(i,j).ne.0.0 ) then |
430 |
taulow(i,j) = 0.0 |
431 |
do L = low_level,lm |
432 |
taulow(i,j) = taulow(i,j) + tau(i,j,L) |
433 |
enddo |
434 |
qdiag(i,j,itaulow ) = qdiag(i,j,itaulow ) + taulow(i,j) |
435 |
qdiag(i,j,itaulowc) = qdiag(i,j,itaulowc) + 1.0 |
436 |
endif |
437 |
enddo |
438 |
enddo |
439 |
endif |
440 |
|
441 |
if( itaumid.ne.0 ) then |
442 |
do j = 1,jm |
443 |
do i = 1,im |
444 |
if( cldmid(i,j).ne.0.0 ) then |
445 |
taumid(i,j) = 0.0 |
446 |
do L = mid_level,low_level+1 |
447 |
taumid(i,j) = taumid(i,j) + tau(i,j,L) |
448 |
enddo |
449 |
qdiag(i,j,itaumid ) = qdiag(i,j,itaumid ) + taumid(i,j) |
450 |
qdiag(i,j,itaumidc) = qdiag(i,j,itaumidc) + 1.0 |
451 |
endif |
452 |
enddo |
453 |
enddo |
454 |
endif |
455 |
|
456 |
if( itauhi.ne.0 ) then |
457 |
do j = 1,jm |
458 |
do i = 1,im |
459 |
if( cldhi(i,j).ne.0.0 ) then |
460 |
tauhi(i,j) = 0.0 |
461 |
do L = 1,mid_level+1 |
462 |
tauhi(i,j) = tauhi(i,j) + tau(i,j,L) |
463 |
enddo |
464 |
qdiag(i,j,itauhi ) = qdiag(i,j,itauhi ) + tauhi(i,j) |
465 |
qdiag(i,j,itauhic) = qdiag(i,j,itauhic) + 1.0 |
466 |
endif |
467 |
enddo |
468 |
enddo |
469 |
endif |
470 |
|
471 |
C*********************************************************************** |
472 |
C **** LOOP OVER GLOBAL REGIONS **** |
473 |
C ********************************************************************** |
474 |
|
475 |
do 1000 nn = 1,npcs |
476 |
|
477 |
C ********************************************************************** |
478 |
C **** VARIABLE INITIALIZATION **** |
479 |
C ********************************************************************** |
480 |
|
481 |
CALL STRIP ( zenith,COSZ,im*jm,ISTRIP,1,NN ) |
482 |
|
483 |
CALL STRIP ( plze, ple ,im*jm,ISTRIP,lm+1,NN) |
484 |
CALL STRIP ( pkz , pk ,im*jm,ISTRIP,lm ,NN) |
485 |
CALL STRIP ( tdry, tzl ,im*jm,ISTRIP,lm ,NN) |
486 |
CALL STRIP ( qz , qzl ,im*jm,ISTRIP,lm ,NN) |
487 |
CALL STRIP ( oz , ozl ,im*jm,ISTRIP,lm ,NN) |
488 |
CALL STRIP ( tau , taul ,im*jm,ISTRIP,lm ,NN) |
489 |
|
490 |
CALL STRIP ( albvisdr,albuvdr,im*jm,ISTRIP,1,NN ) |
491 |
CALL STRIP ( albvisdf,albuvdf,im*jm,ISTRIP,1,NN ) |
492 |
CALL STRIP ( albnirdr,albirdr,im*jm,ISTRIP,1,NN ) |
493 |
CALL STRIP ( albnirdf,albirdf,im*jm,ISTRIP,1,NN ) |
494 |
|
495 |
call strip ( cldtot,clro,im*jm,istrip,lm,nn ) |
496 |
|
497 |
c Partition Tau between Water and Ice Particles |
498 |
c --------------------------------------------- |
499 |
do L= 1,lm |
500 |
do i= 1,istrip |
501 |
alf = min( max((tzl(i,l)-253.15)/20.,0.) ,1.) |
502 |
taua(i,L) = 0. |
503 |
|
504 |
if( alf.ne.0.0 .and. alf.ne.1.0 ) then |
505 |
tauc(i,L,1) = taul(i,L)/(1.+alf/(1-alf) * (reffi/reffw*0.80) ) |
506 |
tauc(i,L,2) = taul(i,L)/(1.+(1-alf)/alf * (reffw/reffi*1.25) ) |
507 |
endif |
508 |
|
509 |
if( alf.eq.0.0 ) then |
510 |
tauc(i,L,1) = taul(i,L) |
511 |
tauc(i,L,2) = 0.0 |
512 |
endif |
513 |
|
514 |
if( alf.eq.1.0 ) then |
515 |
tauc(i,L,1) = 0.0 |
516 |
tauc(i,L,2) = taul(i,L) |
517 |
endif |
518 |
|
519 |
reff(i,L,1) = reffi |
520 |
reff(i,L,2) = reffw |
521 |
enddo |
522 |
enddo |
523 |
|
524 |
call sorad ( istrip,1,1,lm,ple,tzl,qzl,ozl,co2, |
525 |
. tauc,reff,clro,mid_level,low_level,taua, |
526 |
. albirdr,albirdf,albuvdr,albuvdf,cosz, |
527 |
. flux,fluxclr,fdirir,fdifir,dirpar,difpar, |
528 |
. fdiruv,fdifuv ) |
529 |
|
530 |
C ********************************************************************** |
531 |
C **** Compute Mass-Weighted Theta Tendencies from Fluxes **** |
532 |
C ********************************************************************** |
533 |
|
534 |
do l=1,lm |
535 |
alf = grav/(cp*dsig(L)*100) |
536 |
do i=1,istrip |
537 |
dtsw (i,L) = alf*( flux (i,L)-flux (i,L+1) )/pk(i,L) |
538 |
dtswc(i,L) = alf*( fluxclr(i,L)-fluxclr(i,L+1) )/pk(i,L) |
539 |
enddo |
540 |
enddo |
541 |
|
542 |
call paste ( dtsw , dtradsw ,istrip,im*jm,lm,nn ) |
543 |
call paste ( dtswc, dtswclr ,istrip,im*jm,lm,nn ) |
544 |
|
545 |
call paste ( flux (1,1),osr ,istrip,im*jm,1,nn ) |
546 |
call paste ( fluxclr(1,1),osrclr,istrip,im*jm,1,nn ) |
547 |
|
548 |
call paste ( flux (1,lm+1),radswg,istrip,im*jm,1,nn ) |
549 |
call paste ( fluxclr(1,lm+1),swgclr,istrip,im*jm,1,nn ) |
550 |
|
551 |
call paste ( dirpar,fdirpar,istrip,im*jm,1,nn ) |
552 |
call paste ( difpar,fdifpar,istrip,im*jm,1,nn ) |
553 |
|
554 |
c Calculate Mean Albedo |
555 |
c --------------------- |
556 |
do i=1,istrip |
557 |
if( cosz(i).gt.0.0 ) then |
558 |
tstrip(i) = 1.0 - flux(i,lm+1)/ |
559 |
. ( fdirir(i)+fdifir(i)+dirpar(i)+difpar(i) + fdiruv(i)+fdifuv(i) ) |
560 |
if( tstrip(i).lt.0.0 ) tstrip(i) = undef |
561 |
else |
562 |
tstrip(i) = undef |
563 |
endif |
564 |
enddo |
565 |
call paste ( tstrip,albedo,istrip,im*jm,1,nn ) |
566 |
|
567 |
1000 CONTINUE |
568 |
|
569 |
c Mean Albedo Diagnostic |
570 |
c ---------------------- |
571 |
if( ialbedo.gt.0 ) then |
572 |
do j=1,jm |
573 |
do i=1,im |
574 |
if( albedo(i,j).ne.undef ) then |
575 |
qdiag(i,j,ialbedo ) = qdiag(i,j,ialbedo ) + albedo(i,j) |
576 |
qdiag(i,j,ialbedoc) = qdiag(i,j,ialbedoc) + 1.0 |
577 |
endif |
578 |
enddo |
579 |
enddo |
580 |
endif |
581 |
|
582 |
C ********************************************************************** |
583 |
C **** ZERO-OUT OR BUMP COUNTERS **** |
584 |
C ********************************************************************** |
585 |
|
586 |
nswlz = 0 |
587 |
nswcld = 0 |
588 |
imstturb = 0 |
589 |
|
590 |
do L = 1,lm |
591 |
do j = 1,jm |
592 |
do i = 1,im |
593 |
fccave(i,j,L) = 0. |
594 |
qliqave(i,j,L) = 0. |
595 |
enddo |
596 |
enddo |
597 |
enddo |
598 |
|
599 |
return |
600 |
end |
601 |
subroutine opthk ( tl,pl,ple,lz,cf,cfm,lwi,im,jm,lm,tau ) |
602 |
C*********************************************************************** |
603 |
C |
604 |
C PURPOSE: |
605 |
C ======== |
606 |
C Compute cloud optical thickness using temperature and |
607 |
C cloud fractions. |
608 |
C |
609 |
C INPUT: |
610 |
C ====== |
611 |
C tl ......... Temperature at Model Layers (K) |
612 |
C pl ......... Model Layer Pressures (mb) |
613 |
C ple ........ Model Edge Pressures (mb) |
614 |
C lz ......... Diagnosed Convective and Large-Scale Cloud Water (g/g) |
615 |
C cf ......... Total Cloud Fraction (Random + Maximum Overlap) |
616 |
C cfm ........ Maximum Overlap Cloud Fraction |
617 |
C lwi ........ Surface Land Type |
618 |
C im ......... Longitudinal dimension |
619 |
C jm ......... Latitudinal dimension |
620 |
C lm ......... Vertical dimension |
621 |
C |
622 |
C OUTPUT: |
623 |
C ======= |
624 |
C tau ........ Cloud Optical Thickness (non-dimensional) |
625 |
C tau(im,jm,lm,1): Suspended Ice |
626 |
C tau(im,jm,lm,2): Suspended Water |
627 |
C tau(im,jm,lm,3): Raindrops |
628 |
C |
629 |
C*********************************************************************** |
630 |
C* GODDARD LABORATORY FOR ATMOSPHERES * |
631 |
C*********************************************************************** |
632 |
|
633 |
implicit none |
634 |
|
635 |
integer im,jm,lm,i,j,L |
636 |
|
637 |
real tl(im,jm,lm) |
638 |
real pl(im,jm,lm) |
639 |
real ple(im,jm,lm+1) |
640 |
real lz(im,jm,lm) |
641 |
real cf(im,jm,lm) |
642 |
real cfm(im,jm,lm) |
643 |
real tau(im,jm,lm,3) |
644 |
integer lwi(im,jm) |
645 |
|
646 |
real dp, alf, fracls, fraccu |
647 |
real tauice, tauh2o, tauras |
648 |
|
649 |
c Compute Cloud Optical Depths |
650 |
c ---------------------------- |
651 |
do L=1,lm |
652 |
do j=1,jm |
653 |
do i=1,im |
654 |
alf = min( max(( tl(i,j,L)-233.15)/20.,0.) ,1.) |
655 |
dp = ple(i,j,L+1)-ple(i,j,L) |
656 |
tau(i,j,L,1) = 0.0 |
657 |
tau(i,j,L,2) = 0.0 |
658 |
tau(i,j,L,3) = 0.0 |
659 |
if( cf(i,j,L).ne.0.0 ) then |
660 |
|
661 |
c Determine fraction of large-scale and cumulus clouds |
662 |
c ---------------------------------------------------- |
663 |
fracls = ( cf(i,j,L)-cfm(i,j,L) )/cf(i,j,L) |
664 |
fraccu = 1.0-fracls |
665 |
|
666 |
c Define tau for large-scale ice and water clouds |
667 |
c Note: tauice is scaled between (0.02 & .2) for: 0 < lz < 2 mg/kg over Land |
668 |
c Note: tauh2o is scaled between (0.20 & 20) for: 0 < lz < 5 mg/kg over Land |
669 |
c Note: tauh2o is scaled between (0.20 & 12) for: 0 < lz < 50 mg/kg over Ocean |
670 |
c ------------------------------------------------------------------------------- |
671 |
|
672 |
c Large-Scale Ice |
673 |
c --------------- |
674 |
tauice = max( 0.0002, 0.002*min(500*lz(i,j,L)*1000,1.0) ) |
675 |
tau(i,j,L,1) = fracls*(1-alf)*tauice*dp |
676 |
|
677 |
c Large-Scale Water |
678 |
c ----------------- |
679 |
C Over Land |
680 |
if( lwi(i,j).le.10 ) then |
681 |
tauh2o = max( 0.0020, 0.200*min(200*lz(i,j,L)*1000,1.0) ) |
682 |
tau(i,j,L,3) = fracls*alf*tauh2o*dp |
683 |
else |
684 |
C Non-Precipitation Clouds Over Ocean |
685 |
if( lz(i,j,L).eq.0.0 ) then |
686 |
tauh2o = .12 |
687 |
tau(i,j,L,2) = fracls*alf*tauh2o*dp |
688 |
else |
689 |
C Over Ocean |
690 |
tauh2o = max( 0.0020, 0.120*min( 20*lz(i,j,L)*1000,1.0) ) |
691 |
tau(i,j,L,3) = fracls*alf*tauh2o*dp |
692 |
endif |
693 |
endif |
694 |
|
695 |
c Sub-Grid Convective |
696 |
c ------------------- |
697 |
if( tl(i,j,L).gt.210.0 ) then |
698 |
tauras = .16 |
699 |
tau(i,j,L,3) = tau(i,j,L,3) + fraccu*tauras*dp |
700 |
else |
701 |
tauras = tauice |
702 |
tau(i,j,L,1) = tau(i,j,L,1) + fraccu*tauras*dp |
703 |
endif |
704 |
|
705 |
c Define tau for large-scale and cumulus clouds |
706 |
c --------------------------------------------- |
707 |
ccc tau(i,j,L) = ( fracls*( alf*tauh2o + (1-alf)*tauice ) |
708 |
ccc . + fraccu*tauras )*dp |
709 |
|
710 |
endif |
711 |
|
712 |
enddo |
713 |
enddo |
714 |
enddo |
715 |
|
716 |
return |
717 |
end |
718 |
subroutine sorad(m,n,ndim,np,pl,ta,wa,oa,co2, |
719 |
* taucld,reff,fcld,ict,icb, |
720 |
* taual,rsirbm,rsirdf,rsuvbm,rsuvdf,cosz, |
721 |
* flx,flc,fdirir,fdifir,fdirpar,fdifpar, |
722 |
* fdiruv,fdifuv) |
723 |
c******************************************************************** |
724 |
c |
725 |
c This routine computes solar fluxes due to the absoption by water |
726 |
c vapor, ozone, co2, o2, clouds, and aerosols and due to the |
727 |
c scattering by clouds, aerosols, and gases. |
728 |
c |
729 |
c This is a vectorized code. It computes the fluxes simultaneous for |
730 |
c (m x n) soundings, which is a subset of the (m x ndim) soundings. |
731 |
c In a global climate model, m and ndim correspond to the numbers of |
732 |
c grid boxes in the zonal and meridional directions, respectively. |
733 |
c |
734 |
c Ice and liquid cloud particles are allowed to co-exist in any of the |
735 |
c np layers. Two sets of cloud parameters are required as inputs, one |
736 |
c for ice paticles and the other for liquid particles. These parameters |
737 |
c are optical thickness (taucld) and effective particle size (reff). |
738 |
c |
739 |
c If no information is available for reff, a default value of |
740 |
c 10 micron for liquid water and 75 micron for ice can be used. |
741 |
c |
742 |
c Clouds are grouped into high, middle, and low clouds separated by the |
743 |
c level indices ict and icb. For detail, see the subroutine cldscale. |
744 |
c |
745 |
c----- Input parameters: |
746 |
c units size |
747 |
c number of soundings in zonal direction (m) n/d 1 |
748 |
c number of soundings in meridional direction (n) n/d 1 |
749 |
c maximum number of soundings in n/d 1 |
750 |
c meridional direction (ndim) |
751 |
c number of atmospheric layers (np) n/d 1 |
752 |
c level pressure (pl) mb m*ndim*(np+1) |
753 |
c layer temperature (ta) k m*ndim*np |
754 |
c layer specific humidity (wa) gm/gm m*ndim*np |
755 |
c layer ozone concentration (oa) gm/gm m*ndim*np |
756 |
c co2 mixing ratio by volumn (co2) parts/part 1 |
757 |
c cloud optical thickness (taucld) n/d m*ndim*np*2 |
758 |
c index 1 for ice particles |
759 |
c index 2 for liquid drops |
760 |
c effective cloud-particle size (reff) micrometer m*ndim*np*2 |
761 |
c index 1 for ice particles |
762 |
c index 2 for liquid drops |
763 |
c cloud amount (fcld) fraction m*ndim*np |
764 |
c level index separating high and middle n/d 1 |
765 |
c clouds (ict) |
766 |
c level index separating middle and low clouds n/d 1 |
767 |
c clouds (icb) |
768 |
c aerosol optical thickness (taual) n/d m*ndim*np |
769 |
c solar ir surface albedo for beam fraction m*ndim |
770 |
c radiation (rsirbm) |
771 |
c solar ir surface albedo for diffuse fraction m*ndim |
772 |
c radiation (rsirdf) |
773 |
c uv + par surface albedo for beam fraction m*ndim |
774 |
c radiation (rsuvbm) |
775 |
c uv + par surface albedo for diffuse fraction m*ndim |
776 |
c radiation (rsuvdf) |
777 |
c cosine of solar zenith angle (cosz) n/d m*ndim |
778 |
c |
779 |
c----- Output parameters |
780 |
c |
781 |
c all-sky flux (downward minus upward) (flx) fraction m*ndim*(np+1) |
782 |
c clear-sky flux (downward minus upward) (flc) fraction m*ndim*(np+1) |
783 |
c all-sky direct downward ir (0.7-10 micron) |
784 |
c flux at the surface (fdirir) fraction m*ndim |
785 |
c all-sky diffuse downward ir flux at |
786 |
c the surface (fdifir) fraction m*ndim |
787 |
c all-sky direct downward par (0.4-0.7 micron) |
788 |
c flux at the surface (fdirpar) fraction m*ndim |
789 |
c all-sky diffuse downward par flux at |
790 |
c the surface (fdifpar) fraction m*ndim |
791 |
* |
792 |
c----- Notes: |
793 |
c |
794 |
c (1) The unit of flux is fraction of the incoming solar radiation |
795 |
c at the top of the atmosphere. Therefore, fluxes should |
796 |
c be equal to flux multiplied by the extra-terrestrial solar |
797 |
c flux and the cosine of solar zenith angle. |
798 |
c (2) Clouds and aerosols can be included in any layers by specifying |
799 |
c fcld(i,j,k), taucld(i,j,k,*) and taual(i,j,k), k=1,np. |
800 |
c For an atmosphere without clouds and aerosols, |
801 |
c set fcld(i,j,k)=taucld(i,j,k,*)=taual(i,j,k)=0.0. |
802 |
c (3) Aerosol single scattering albedos and asymmetry |
803 |
c factors are specified in the subroutines solir and soluv. |
804 |
c (4) pl(i,j,1) is the pressure at the top of the model, and |
805 |
c pl(i,j,np+1) is the surface pressure. |
806 |
c (5) the pressure levels ict and icb correspond approximately |
807 |
c to 400 and 700 mb. |
808 |
c |
809 |
c************************************************************************** |
810 |
|
811 |
implicit none |
812 |
|
813 |
c-----Explicit Inline Directives |
814 |
|
815 |
#if CRAY |
816 |
#if f77 |
817 |
cfpp$ expand (expmn) |
818 |
#endif |
819 |
#endif |
820 |
real expmn |
821 |
|
822 |
c-----input parameters |
823 |
|
824 |
integer m,n,ndim,np,ict,icb |
825 |
real pl(m,ndim,np+1),ta(m,ndim,np),wa(m,ndim,np),oa(m,ndim,np) |
826 |
real taucld(m,ndim,np,2),reff(m,ndim,np,2) |
827 |
real fcld(m,ndim,np),taual(m,ndim,np) |
828 |
real rsirbm(m,ndim),rsirdf(m,ndim), |
829 |
* rsuvbm(m,ndim),rsuvdf(m,ndim),cosz(m,ndim),co2 |
830 |
|
831 |
c-----output parameters |
832 |
|
833 |
real flx(m,ndim,np+1),flc(m,ndim,np+1) |
834 |
real fdirir(m,ndim),fdifir(m,ndim) |
835 |
real fdirpar(m,ndim),fdifpar(m,ndim) |
836 |
real fdiruv(m,ndim),fdifuv(m,ndim) |
837 |
|
838 |
c-----temporary array |
839 |
|
840 |
integer i,j,k,ik |
841 |
real cc(m,n,3),tauclb(m,n,np),tauclf(m,n,np) |
842 |
real dp(m,n,np),wh(m,n,np),oh(m,n,np),scal(m,n,np) |
843 |
real swh(m,n,np+1),so2(m,n,np+1),df(m,n,np+1) |
844 |
real sdf(m,n),sclr(m,n),csm(m,n),taux,x |
845 |
|
846 |
c----------------------------------------------------------------- |
847 |
|
848 |
do j= 1, n |
849 |
do i= 1, m |
850 |
|
851 |
swh(i,j,1)=0. |
852 |
so2(i,j,1)=0. |
853 |
|
854 |
c-----csm is the effective secant of the solar zenith angle |
855 |
c see equation (12) of Lacis and Hansen (1974, JAS) |
856 |
|
857 |
csm(i,j)=35./sqrt(1224.*cosz(i,j)*cosz(i,j)+1.) |
858 |
|
859 |
enddo |
860 |
enddo |
861 |
|
862 |
|
863 |
do k= 1, np |
864 |
do j= 1, n |
865 |
do i= 1, m |
866 |
|
867 |
c-----compute layer thickness and pressure-scaling function. |
868 |
c indices for the surface level and surface layer |
869 |
c are np+1 and np, respectively. |
870 |
|
871 |
dp(i,j,k)=pl(i,j,k+1)-pl(i,j,k) |
872 |
scal(i,j,k)=dp(i,j,k)*(.5*(pl(i,j,k)+pl(i,j,k+1))/300.)**.8 |
873 |
|
874 |
c-----compute scaled water vapor amount, unit is g/cm**2 |
875 |
|
876 |
wh(i,j,k)=1.02*wa(i,j,k)*scal(i,j,k)* |
877 |
* (1.+0.00135*(ta(i,j,k)-240.)) |
878 |
swh(i,j,k+1)=swh(i,j,k)+wh(i,j,k) |
879 |
|
880 |
c-----compute ozone amount, unit is (cm-atm)stp. |
881 |
|
882 |
oh(i,j,k)=1.02*oa(i,j,k)*dp(i,j,k)*466.7 |
883 |
|
884 |
enddo |
885 |
enddo |
886 |
enddo |
887 |
|
888 |
|
889 |
c-----scale cloud optical thickness in each layer from taucld (with |
890 |
c cloud amount fcld) to tauclb and tauclf (with cloud amount cc). |
891 |
c tauclb is the scaled optical thickness for beam radiation and |
892 |
c tauclf is for diffuse radiation. |
893 |
|
894 |
call cldscale(m,n,ndim,np,cosz,fcld,taucld,ict,icb, |
895 |
* cc,tauclb,tauclf) |
896 |
|
897 |
c-----initialize fluxes for all-sky (flx), clear-sky (flc), and |
898 |
c flux reduction (df) |
899 |
|
900 |
do k=1, np+1 |
901 |
do j=1, n |
902 |
do i=1, m |
903 |
flx(i,j,k)=0. |
904 |
flc(i,j,k)=0. |
905 |
df(i,j,k)=0. |
906 |
enddo |
907 |
enddo |
908 |
enddo |
909 |
|
910 |
c-----compute solar ir fluxes |
911 |
|
912 |
call solir (m,n,ndim,np,wh,taucld,tauclb,tauclf,reff,ict,icb |
913 |
* ,fcld,cc,taual,csm,rsirbm,rsirdf,flx,flc,fdirir,fdifir) |
914 |
|
915 |
c-----compute and update uv and par fluxes |
916 |
|
917 |
call soluv (m,n,ndim,np,oh,dp,taucld,tauclb,tauclf,reff,ict,icb |
918 |
* ,fcld,cc,taual,csm,rsuvbm,rsuvdf,flx,flc |
919 |
* ,fdirpar,fdifpar,fdiruv,fdifuv) |
920 |
|
921 |
c-----compute scaled amount of o2 (so2), unit is (cm-atm)stp. |
922 |
|
923 |
do k= 1, np |
924 |
do j= 1, n |
925 |
do i= 1, m |
926 |
so2(i,j,k+1)=so2(i,j,k)+165.22*scal(i,j,k) |
927 |
enddo |
928 |
enddo |
929 |
enddo |
930 |
|
931 |
c-----compute flux reduction due to oxygen following |
932 |
c chou (J. climate, 1990). The fraction 0.0287 is the |
933 |
c extraterrestrial solar flux in the o2 bands. |
934 |
|
935 |
do k= 2, np+1 |
936 |
do j= 1, n |
937 |
do i= 1, m |
938 |
x=so2(i,j,k)*csm(i,j) |
939 |
df(i,j,k)=df(i,j,k)+0.0287*(1.-expmn(-0.00027*sqrt(x))) |
940 |
enddo |
941 |
enddo |
942 |
enddo |
943 |
|
944 |
c-----compute scaled amounts for co2 (so2). unit is (cm-atm)stp. |
945 |
|
946 |
do k= 1, np |
947 |
do j= 1, n |
948 |
do i= 1, m |
949 |
so2(i,j,k+1)=so2(i,j,k)+co2*789.*scal(i,j,k) |
950 |
enddo |
951 |
enddo |
952 |
enddo |
953 |
|
954 |
c-----compute and update flux reduction due to co2 following |
955 |
c chou (J. Climate, 1990) |
956 |
|
957 |
call flxco2(m,n,np,so2,swh,csm,df) |
958 |
|
959 |
c-----adjust for the effect of o2 cnd co2 on clear-sky fluxes. |
960 |
|
961 |
do k= 2, np+1 |
962 |
do j= 1, n |
963 |
do i= 1, m |
964 |
flc(i,j,k)=flc(i,j,k)-df(i,j,k) |
965 |
enddo |
966 |
enddo |
967 |
enddo |
968 |
|
969 |
c-----adjust for the all-sky fluxes due to o2 and co2. It is |
970 |
c assumed that o2 and co2 have no effects on solar radiation |
971 |
c below clouds. clouds are assumed randomly overlapped. |
972 |
|
973 |
do j=1,n |
974 |
do i=1,m |
975 |
sdf(i,j)=0.0 |
976 |
sclr(i,j)=1.0 |
977 |
enddo |
978 |
enddo |
979 |
|
980 |
do k=1,np |
981 |
do j=1,n |
982 |
do i=1,m |
983 |
|
984 |
c-----sclr is the fraction of clear sky. |
985 |
c sdf is the flux reduction below clouds. |
986 |
|
987 |
if(fcld(i,j,k).gt.0.01) then |
988 |
sdf(i,j)=sdf(i,j)+df(i,j,k)*sclr(i,j)*fcld(i,j,k) |
989 |
sclr(i,j)=sclr(i,j)*(1.-fcld(i,j,k)) |
990 |
endif |
991 |
flx(i,j,k+1)=flx(i,j,k+1)-sdf(i,j)-df(i,j,k+1)*sclr(i,j) |
992 |
|
993 |
enddo |
994 |
enddo |
995 |
enddo |
996 |
|
997 |
c-----adjust for the direct downward ir flux. |
998 |
do j= 1, n |
999 |
do i= 1, m |
1000 |
x = (1.-rsirdf(i,j))*fdifir(i,j) + (1.-rsirbm(i,j))*fdirir(i,j) |
1001 |
x = (-sdf(i,j)-df(i,j,np+1)*sclr(i,j))/x |
1002 |
fdirir(i,j)=fdirir(i,j)*(1.+x) |
1003 |
fdifir(i,j)=fdifir(i,j)*(1.+x) |
1004 |
enddo |
1005 |
enddo |
1006 |
|
1007 |
return |
1008 |
end |
1009 |
|
1010 |
c******************************************************************** |
1011 |
|
1012 |
subroutine cldscale (m,n,ndim,np,cosz,fcld,taucld,ict,icb, |
1013 |
* cc,tauclb,tauclf) |
1014 |
|
1015 |
c******************************************************************** |
1016 |
c |
1017 |
c This subroutine computes the covers of high, middle, and |
1018 |
c low clouds and scales the cloud optical thickness. |
1019 |
c |
1020 |
c To simplify calculations in a cloudy atmosphere, clouds are |
1021 |
c grouped into high, middle and low clouds separated by the levels |
1022 |
c ict and icb (level 1 is the top of the atmosphere). |
1023 |
c |
1024 |
c Within each of the three groups, clouds are assumed maximally |
1025 |
c overlapped, and the cloud cover (cc) of a group is the maximum |
1026 |
c cloud cover of all the layers in the group. The optical thickness |
1027 |
c (taucld) of a given layer is then scaled to new values (tauclb and |
1028 |
c tauclf) so that the layer reflectance corresponding to the cloud |
1029 |
c cover cc is the same as the original reflectance with optical |
1030 |
c thickness taucld and cloud cover fcld. |
1031 |
c |
1032 |
c---input parameters |
1033 |
c |
1034 |
c number of grid intervals in zonal direction (m) |
1035 |
c number of grid intervals in meridional direction (n) |
1036 |
c maximum number of grid intervals in meridional direction (ndim) |
1037 |
c number of atmospheric layers (np) |
1038 |
c cosine of the solar zenith angle (cosz) |
1039 |
c fractional cloud cover (fcld) |
1040 |
c cloud optical thickness (taucld) |
1041 |
c index separating high and middle clouds (ict) |
1042 |
c index separating middle and low clouds (icb) |
1043 |
c |
1044 |
c---output parameters |
1045 |
c |
1046 |
c fractional cover of high, middle, and low clouds (cc) |
1047 |
c scaled cloud optical thickness for beam radiation (tauclb) |
1048 |
c scaled cloud optical thickness for diffuse radiation (tauclf) |
1049 |
c |
1050 |
c******************************************************************** |
1051 |
|
1052 |
implicit none |
1053 |
|
1054 |
c-----input parameters |
1055 |
|
1056 |
integer m,n,ndim,np,ict,icb |
1057 |
real cosz(m,ndim),fcld(m,ndim,np),taucld(m,ndim,np,2) |
1058 |
|
1059 |
c-----output parameters |
1060 |
|
1061 |
real cc(m,n,3),tauclb(m,n,np),tauclf(m,n,np) |
1062 |
|
1063 |
c-----temporary variables |
1064 |
|
1065 |
integer i,j,k,im,it,ia,kk |
1066 |
real fm,ft,fa,xai,taucl,taux |
1067 |
|
1068 |
c-----pre-computed table |
1069 |
|
1070 |
integer nm,nt,na |
1071 |
parameter (nm=11,nt=9,na=11) |
1072 |
real dm,dt,da,t1,caib(nm,nt,na),caif(nt,na) |
1073 |
parameter (dm=0.1,dt=0.30103,da=0.1,t1=-0.9031) |
1074 |
|
1075 |
c-----include the pre-computed table for cai |
1076 |
|
1077 |
include 'cai.dat' |
1078 |
save caib,caif |
1079 |
|
1080 |
|
1081 |
c-----clouds within each of the high, middle, and low clouds are |
1082 |
c assumed maximally overlapped, and the cloud cover (cc) |
1083 |
c for a group is the maximum cloud cover of all the layers |
1084 |
c in the group |
1085 |
|
1086 |
do j=1,n |
1087 |
do i=1,m |
1088 |
cc(i,j,1)=0.0 |
1089 |
cc(i,j,2)=0.0 |
1090 |
cc(i,j,3)=0.0 |
1091 |
enddo |
1092 |
enddo |
1093 |
|
1094 |
do k=1,ict-1 |
1095 |
do j=1,n |
1096 |
do i=1,m |
1097 |
cc(i,j,1)=max(cc(i,j,1),fcld(i,j,k)) |
1098 |
enddo |
1099 |
enddo |
1100 |
enddo |
1101 |
|
1102 |
do k=ict,icb-1 |
1103 |
do j=1,n |
1104 |
do i=1,m |
1105 |
cc(i,j,2)=max(cc(i,j,2),fcld(i,j,k)) |
1106 |
enddo |
1107 |
enddo |
1108 |
enddo |
1109 |
|
1110 |
do k=icb,np |
1111 |
do j=1,n |
1112 |
do i=1,m |
1113 |
cc(i,j,3)=max(cc(i,j,3),fcld(i,j,k)) |
1114 |
enddo |
1115 |
enddo |
1116 |
enddo |
1117 |
|
1118 |
c-----scale the cloud optical thickness. |
1119 |
c taucld(i,j,k,1) is the optical thickness for ice particles, and |
1120 |
c taucld(i,j,k,2) is the optical thickness for liquid particles. |
1121 |
|
1122 |
do k=1,np |
1123 |
|
1124 |
if(k.lt.ict) then |
1125 |
kk=1 |
1126 |
elseif(k.ge.ict .and. k.lt.icb) then |
1127 |
kk=2 |
1128 |
else |
1129 |
kk=3 |
1130 |
endif |
1131 |
|
1132 |
do j=1,n |
1133 |
do i=1,m |
1134 |
|
1135 |
tauclb(i,j,k) = 0.0 |
1136 |
tauclf(i,j,k) = 0.0 |
1137 |
|
1138 |
taux=taucld(i,j,k,1)+taucld(i,j,k,2) |
1139 |
if (taux.gt.0.05 .and. fcld(i,j,k).gt.0.01) then |
1140 |
|
1141 |
c-----normalize cloud cover |
1142 |
|
1143 |
fa=fcld(i,j,k)/cc(i,j,kk) |
1144 |
|
1145 |
c-----table look-up |
1146 |
|
1147 |
taux=min(taux,32.) |
1148 |
|
1149 |
fm=cosz(i,j)/dm |
1150 |
ft=(log10(taux)-t1)/dt |
1151 |
fa=fa/da |
1152 |
|
1153 |
im=int(fm+1.5) |
1154 |
it=int(ft+1.5) |
1155 |
ia=int(fa+1.5) |
1156 |
|
1157 |
im=max(im,2) |
1158 |
it=max(it,2) |
1159 |
ia=max(ia,2) |
1160 |
|
1161 |
im=min(im,nm-1) |
1162 |
it=min(it,nt-1) |
1163 |
ia=min(ia,na-1) |
1164 |
|
1165 |
fm=fm-float(im-1) |
1166 |
ft=ft-float(it-1) |
1167 |
fa=fa-float(ia-1) |
1168 |
|
1169 |
c-----scale cloud optical thickness for beam radiation. |
1170 |
c the scaling factor, xai, is a function of the solar zenith |
1171 |
c angle, optical thickness, and cloud cover. |
1172 |
|
1173 |
xai= (-caib(im-1,it,ia)*(1.-fm)+ |
1174 |
* caib(im+1,it,ia)*(1.+fm))*fm*.5+caib(im,it,ia)*(1.-fm*fm) |
1175 |
|
1176 |
xai=xai+(-caib(im,it-1,ia)*(1.-ft)+ |
1177 |
* caib(im,it+1,ia)*(1.+ft))*ft*.5+caib(im,it,ia)*(1.-ft*ft) |
1178 |
|
1179 |
xai=xai+(-caib(im,it,ia-1)*(1.-fa)+ |
1180 |
* caib(im,it,ia+1)*(1.+fa))*fa*.5+caib(im,it,ia)*(1.-fa*fa) |
1181 |
|
1182 |
xai= xai-2.*caib(im,it,ia) |
1183 |
xai=max(xai,0.0) |
1184 |
|
1185 |
tauclb(i,j,k) = taux*xai |
1186 |
|
1187 |
c-----scale cloud optical thickness for diffuse radiation. |
1188 |
c the scaling factor, xai, is a function of the cloud optical |
1189 |
c thickness and cover but not the solar zenith angle. |
1190 |
|
1191 |
xai= (-caif(it-1,ia)*(1.-ft)+ |
1192 |
* caif(it+1,ia)*(1.+ft))*ft*.5+caif(it,ia)*(1.-ft*ft) |
1193 |
|
1194 |
xai=xai+(-caif(it,ia-1)*(1.-fa)+ |
1195 |
* caif(it,ia+1)*(1.+fa))*fa*.5+caif(it,ia)*(1.-fa*fa) |
1196 |
|
1197 |
xai= xai-caif(it,ia) |
1198 |
xai=max(xai,0.0) |
1199 |
|
1200 |
tauclf(i,j,k) = taux*xai |
1201 |
|
1202 |
endif |
1203 |
|
1204 |
enddo |
1205 |
enddo |
1206 |
enddo |
1207 |
|
1208 |
return |
1209 |
end |
1210 |
c*********************************************************************** |
1211 |
|
1212 |
subroutine solir (m,n,ndim,np,wh,taucld,tauclb,tauclf,reff, |
1213 |
* ict,icb,fcld,cc,taual,csm,rsirbm,rsirdf,flx,flc,fdirir,fdifir) |
1214 |
|
1215 |
c************************************************************************ |
1216 |
c compute solar flux in the infrared region. The spectrum is divided |
1217 |
c into three bands: |
1218 |
c |
1219 |
c band wavenumber(/cm) wavelength (micron) |
1220 |
c 1 1000-4400 2.27-10.0 |
1221 |
c 2 4400-8200 1.22-2.27 |
1222 |
c 3 8200-14300 0.70-1.22 |
1223 |
c |
1224 |
c----- Input parameters: units size |
1225 |
c |
1226 |
c number of soundings in zonal direction (m) n/d 1 |
1227 |
c number of soundings in meridional direction (n) n/d 1 |
1228 |
c maximum number of soundings in n/d 1 |
1229 |
c meridional direction (ndim) |
1230 |
c number of atmospheric layers (np) n/d 1 |
1231 |
c layer water vapor content (wh) gm/cm^2 m*n*np |
1232 |
c cloud optical thickness (taucld) n/d m*ndim*np*2 |
1233 |
c index 1 for ice paticles |
1234 |
c index 2 for liquid particles |
1235 |
c scaled cloud optical thickness n/d m*n*np |
1236 |
c for beam radiation (tauclb) |
1237 |
c scaled cloud optical thickness n/d m*n*np |
1238 |
c for diffuse radiation (tauclf) |
1239 |
c effective cloud-particle size (reff) micrometer m*ndim*np*2 |
1240 |
c index 1 for ice paticles |
1241 |
c index 2 for liquid particles |
1242 |
c level index separating high and n/d m*n |
1243 |
c middle clouds (ict) |
1244 |
c level index separating middle and n/d m*n |
1245 |
c low clouds (icb) |
1246 |
c cloud amount (fcld) fraction m*ndim*np |
1247 |
c cloud amount of high, middle, and n/d m*n*3 |
1248 |
c low clouds (cc) |
1249 |
c aerosol optical thickness (taual) n/d m*ndim*np |
1250 |
c cosecant of the solar zenith angle (csm) n/d m*n |
1251 |
c near ir surface albedo for beam fraction m*ndim |
1252 |
c radiation (rsirbm) |
1253 |
c near ir surface albedo for diffuse fraction m*ndim |
1254 |
c radiation (rsirdf) |
1255 |
c |
1256 |
c----- output (updated) parameters: |
1257 |
c |
1258 |
c all-sky flux (downward-upward) (flx) fraction m*ndim*(np+1) |
1259 |
c clear-sky flux (downward-upward) (flc) fraction m*ndim*(np+1) |
1260 |
c all-sky direct downward ir flux at |
1261 |
c the surface (fdirir) fraction m*ndim |
1262 |
c all-sky diffuse downward ir flux at |
1263 |
c the surface (fdifir) fraction m*ndim |
1264 |
c |
1265 |
c----- note: the following parameters must be specified by users: |
1266 |
c aerosol single scattering albedo (ssaal) n/d nband |
1267 |
c aerosol asymmetry factor (asyal) n/d nband |
1268 |
c |
1269 |
c************************************************************************* |
1270 |
|
1271 |
implicit none |
1272 |
|
1273 |
c-----Explicit Inline Directives |
1274 |
|
1275 |
#if CRAY |
1276 |
#if f77 |
1277 |
cfpp$ expand (deledd) |
1278 |
cfpp$ expand (sagpol) |
1279 |
cfpp$ expand (expmn) |
1280 |
#endif |
1281 |
#endif |
1282 |
real expmn |
1283 |
|
1284 |
c-----input parameters |
1285 |
|
1286 |
integer m,n,ndim,np,ict,icb |
1287 |
real taucld(m,ndim,np,2),reff(m,ndim,np,2),fcld(m,ndim,np) |
1288 |
real tauclb(m,n,np),tauclf(m,n,np),cc(m,n,3) |
1289 |
real rsirbm(m,ndim),rsirdf(m,ndim) |
1290 |
real wh(m,n,np),taual(m,ndim,np),csm(m,n) |
1291 |
|
1292 |
c-----output (updated) parameters |
1293 |
|
1294 |
real flx(m,ndim,np+1),flc(m,ndim,np+1) |
1295 |
real fdirir(m,ndim),fdifir(m,ndim) |
1296 |
|
1297 |
c-----static parameters |
1298 |
|
1299 |
integer nk,nband |
1300 |
parameter (nk=10,nband=3) |
1301 |
real xk(nk),hk(nband,nk),ssaal(nband),asyal(nband) |
1302 |
real aia(nband,3),awa(nband,3),aig(nband,3),awg(nband,3) |
1303 |
|
1304 |
c-----temporary array |
1305 |
|
1306 |
integer ib,ik,i,j,k |
1307 |
real ssacl(m,n,np),asycl(m,n,np) |
1308 |
real rr(m,n,np+1,2),tt(m,n,np+1,2),td(m,n,np+1,2), |
1309 |
* rs(m,n,np+1,2),ts(m,n,np+1,2) |
1310 |
real rssab(m,n,np+1),rabx(m,n,np+1),rsabx(m,n,np+1) |
1311 |
real fall(m,n,np+1),fclr(m,n,np+1) |
1312 |
real fsdir(m,n),fsdif(m,n) |
1313 |
|
1314 |
real tauwv,tausto,ssatau,asysto,tauto,ssato,asyto |
1315 |
real taux,reff1,reff2,w1,w2,g1,g2 |
1316 |
real ssaclt(m,n),asyclt(m,n) |
1317 |
real rr1t(m,n),tt1t(m,n),td1t(m,n),rs1t(m,n),ts1t(m,n) |
1318 |
real rr2t(m,n),tt2t(m,n),td2t(m,n),rs2t(m,n),ts2t(m,n) |
1319 |
|
1320 |
c-----water vapor absorption coefficient for 10 k-intervals. |
1321 |
c unit: cm^2/gm |
1322 |
|
1323 |
data xk/ |
1324 |
1 0.0010, 0.0133, 0.0422, 0.1334, 0.4217, |
1325 |
2 1.334, 5.623, 31.62, 177.8, 1000.0/ |
1326 |
|
1327 |
c-----water vapor k-distribution function, |
1328 |
c the sum of hk is 0.52926. unit: fraction |
1329 |
|
1330 |
data hk/ |
1331 |
1 .01074,.08236,.20673, .00360,.01157,.03497, |
1332 |
2 .00411,.01133,.03011, .00421,.01143,.02260, |
1333 |
3 .00389,.01240,.01336, .00326,.01258,.00696, |
1334 |
4 .00499,.01381,.00441, .00465,.00650,.00115, |
1335 |
5 .00245,.00244,.00026, .00145,.00094,.00000/ |
1336 |
|
1337 |
c-----aerosol single-scattering albedo and asymmetry factor |
1338 |
|
1339 |
data ssaal,asyal/nband*0.999,nband*0.850/ |
1340 |
|
1341 |
c-----coefficients for computing the single scattering albedo of |
1342 |
c ice clouds from ssa=1-(aia(*,1)+aia(*,2)*reff+aia(*,3)*reff**2) |
1343 |
|
1344 |
data aia/ |
1345 |
1 .08938331, .00215346,-.00000260, |
1346 |
2 .00299387, .00073709, .00000746, |
1347 |
3 -.00001038,-.00000134, .00000000/ |
1348 |
|
1349 |
c-----coefficients for computing the single scattering albedo of |
1350 |
c liquid clouds from ssa=1-(awa(*,1)+awa(*,2)*reff+awa(*,3)*reff**2) |
1351 |
|
1352 |
data awa/ |
1353 |
1 .01209318,-.00019934, .00000007, |
1354 |
2 .01784739, .00088757, .00000845, |
1355 |
3 -.00036910,-.00000650,-.00000004/ |
1356 |
|
1357 |
c-----coefficients for computing the asymmetry factor of ice clouds |
1358 |
c from asycl=aig(*,1)+aig(*,2)*reff+aig(*,3)*reff**2 |
1359 |
|
1360 |
data aig/ |
1361 |
1 .84090400, .76098937, .74935228, |
1362 |
2 .00126222, .00141864, .00119715, |
1363 |
3 -.00000385,-.00000396,-.00000367/ |
1364 |
|
1365 |
c-----coefficients for computing the asymmetry factor of liquid clouds |
1366 |
c from asycl=awg(*,1)+awg(*,2)*reff+awg(*,3)*reff**2 |
1367 |
|
1368 |
data awg/ |
1369 |
1 .83530748, .74513197, .79375035, |
1370 |
2 .00257181, .01370071, .00832441, |
1371 |
3 .00005519,-.00038203,-.00023263/ |
1372 |
|
1373 |
c-----initialize surface fluxes, reflectances, and transmittances |
1374 |
|
1375 |
do j= 1, n |
1376 |
do i= 1, m |
1377 |
fdirir(i,j)=0.0 |
1378 |
fdifir(i,j)=0.0 |
1379 |
rr(i,j,np+1,1)=rsirbm(i,j) |
1380 |
rr(i,j,np+1,2)=rsirbm(i,j) |
1381 |
rs(i,j,np+1,1)=rsirdf(i,j) |
1382 |
rs(i,j,np+1,2)=rsirdf(i,j) |
1383 |
td(i,j,np+1,1)=0.0 |
1384 |
td(i,j,np+1,2)=0.0 |
1385 |
tt(i,j,np+1,1)=0.0 |
1386 |
tt(i,j,np+1,2)=0.0 |
1387 |
ts(i,j,np+1,1)=0.0 |
1388 |
ts(i,j,np+1,2)=0.0 |
1389 |
enddo |
1390 |
enddo |
1391 |
|
1392 |
c-----integration over spectral bands |
1393 |
|
1394 |
do 100 ib=1,nband |
1395 |
|
1396 |
c-----compute cloud single scattering albedo and asymmetry factor |
1397 |
c for a mixture of ice and liquid particles. |
1398 |
|
1399 |
do k= 1, np |
1400 |
|
1401 |
do j= 1, n |
1402 |
do i= 1, m |
1403 |
|
1404 |
ssaclt(i,j)=1.0 |
1405 |
asyclt(i,j)=1.0 |
1406 |
|
1407 |
taux=taucld(i,j,k,1)+taucld(i,j,k,2) |
1408 |
if (taux.gt.0.05 .and. fcld(i,j,k).gt.0.01) then |
1409 |
|
1410 |
reff1=min(reff(i,j,k,1),130.) |
1411 |
reff2=min(reff(i,j,k,2),20.0) |
1412 |
|
1413 |
w1=(1.-(aia(ib,1)+(aia(ib,2)+ |
1414 |
* aia(ib,3)*reff1)*reff1))*taucld(i,j,k,1) |
1415 |
w2=(1.-(awa(ib,1)+(awa(ib,2)+ |
1416 |
* awa(ib,3)*reff2)*reff2))*taucld(i,j,k,2) |
1417 |
ssaclt(i,j)=(w1+w2)/taux |
1418 |
|
1419 |
g1=(aig(ib,1)+(aig(ib,2)+aig(ib,3)*reff1)*reff1)*w1 |
1420 |
g2=(awg(ib,1)+(awg(ib,2)+awg(ib,3)*reff2)*reff2)*w2 |
1421 |
asyclt(i,j)=(g1+g2)/(w1+w2) |
1422 |
|
1423 |
endif |
1424 |
|
1425 |
enddo |
1426 |
enddo |
1427 |
|
1428 |
do j=1,n |
1429 |
do i=1,m |
1430 |
ssacl(i,j,k)=ssaclt(i,j) |
1431 |
enddo |
1432 |
enddo |
1433 |
do j=1,n |
1434 |
do i=1,m |
1435 |
asycl(i,j,k)=asyclt(i,j) |
1436 |
enddo |
1437 |
enddo |
1438 |
|
1439 |
enddo |
1440 |
|
1441 |
c-----integration over the k-distribution function |
1442 |
|
1443 |
do 200 ik=1,nk |
1444 |
|
1445 |
do 300 k= 1, np |
1446 |
|
1447 |
do j= 1, n |
1448 |
do i= 1, m |
1449 |
|
1450 |
tauwv=xk(ik)*wh(i,j,k) |
1451 |
|
1452 |
c-----compute total optical thickness, single scattering albedo, |
1453 |
c and asymmetry factor. |
1454 |
|
1455 |
tausto=tauwv+taual(i,j,k)+1.0e-8 |
1456 |
ssatau=ssaal(ib)*taual(i,j,k) |
1457 |
asysto=asyal(ib)*ssaal(ib)*taual(i,j,k) |
1458 |
|
1459 |
c-----compute reflectance and transmittance for cloudless layers |
1460 |
|
1461 |
tauto=tausto |
1462 |
ssato=ssatau/tauto+1.0e-8 |
1463 |
|
1464 |
c if (ssato .gt. 0.001) then |
1465 |
|
1466 |
c ssato=min(ssato,0.999999) |
1467 |
c asyto=asysto/(ssato*tauto) |
1468 |
|
1469 |
c call deledd(tauto,ssato,asyto,csm(i,j), |
1470 |
c * rr1t(i,j),tt1t(i,j),td1t(i,j)) |
1471 |
|
1472 |
c call sagpol (tauto,ssato,asyto,rs1t(i,j),ts1t(i,j)) |
1473 |
|
1474 |
c else |
1475 |
|
1476 |
td1t(i,j)=expmn(-tauto*csm(i,j)) |
1477 |
ts1t(i,j)=expmn(-1.66*tauto) |
1478 |
tt1t(i,j)=0.0 |
1479 |
rr1t(i,j)=0.0 |
1480 |
rs1t(i,j)=0.0 |
1481 |
|
1482 |
c endif |
1483 |
|
1484 |
c-----compute reflectance and transmittance for cloud layers |
1485 |
|
1486 |
if (tauclb(i,j,k) .lt. 0.01) then |
1487 |
|
1488 |
rr2t(i,j)=rr1t(i,j) |
1489 |
tt2t(i,j)=tt1t(i,j) |
1490 |
td2t(i,j)=td1t(i,j) |
1491 |
rs2t(i,j)=rs1t(i,j) |
1492 |
ts2t(i,j)=ts1t(i,j) |
1493 |
|
1494 |
else |
1495 |
|
1496 |
tauto=tausto+tauclb(i,j,k) |
1497 |
ssato=(ssatau+ssacl(i,j,k)*tauclb(i,j,k))/tauto+1.0e-8 |
1498 |
ssato=min(ssato,0.999999) |
1499 |
asyto=(asysto+asycl(i,j,k)*ssacl(i,j,k)*tauclb(i,j,k))/ |
1500 |
* (ssato*tauto) |
1501 |
|
1502 |
call deledd(tauto,ssato,asyto,csm(i,j), |
1503 |
* rr2t(i,j),tt2t(i,j),td2t(i,j)) |
1504 |
|
1505 |
tauto=tausto+tauclf(i,j,k) |
1506 |
ssato=(ssatau+ssacl(i,j,k)*tauclf(i,j,k))/tauto+1.0e-8 |
1507 |
ssato=min(ssato,0.999999) |
1508 |
asyto=(asysto+asycl(i,j,k)*ssacl(i,j,k)*tauclf(i,j,k))/ |
1509 |
* (ssato*tauto) |
1510 |
|
1511 |
call sagpol (tauto,ssato,asyto,rs2t(i,j),ts2t(i,j)) |
1512 |
|
1513 |
endif |
1514 |
|
1515 |
enddo |
1516 |
enddo |
1517 |
|
1518 |
c-----the following code appears to be awkward, but it is efficient |
1519 |
c in certain parallel processors. |
1520 |
|
1521 |
do j=1,n |
1522 |
do i=1,m |
1523 |
rr(i,j,k,1)=rr1t(i,j) |
1524 |
enddo |
1525 |
enddo |
1526 |
do j=1,n |
1527 |
do i=1,m |
1528 |
tt(i,j,k,1)=tt1t(i,j) |
1529 |
enddo |
1530 |
enddo |
1531 |
do j=1,n |
1532 |
do i=1,m |
1533 |
td(i,j,k,1)=td1t(i,j) |
1534 |
enddo |
1535 |
enddo |
1536 |
do j=1,n |
1537 |
do i=1,m |
1538 |
rs(i,j,k,1)=rs1t(i,j) |
1539 |
enddo |
1540 |
enddo |
1541 |
do j=1,n |
1542 |
do i=1,m |
1543 |
ts(i,j,k,1)=ts1t(i,j) |
1544 |
enddo |
1545 |
enddo |
1546 |
|
1547 |
do j=1,n |
1548 |
do i=1,m |
1549 |
rr(i,j,k,2)=rr2t(i,j) |
1550 |
enddo |
1551 |
enddo |
1552 |
do j=1,n |
1553 |
do i=1,m |
1554 |
tt(i,j,k,2)=tt2t(i,j) |
1555 |
enddo |
1556 |
enddo |
1557 |
do j=1,n |
1558 |
do i=1,m |
1559 |
td(i,j,k,2)=td2t(i,j) |
1560 |
enddo |
1561 |
enddo |
1562 |
do j=1,n |
1563 |
do i=1,m |
1564 |
rs(i,j,k,2)=rs2t(i,j) |
1565 |
enddo |
1566 |
enddo |
1567 |
do j=1,n |
1568 |
do i=1,m |
1569 |
ts(i,j,k,2)=ts2t(i,j) |
1570 |
enddo |
1571 |
enddo |
1572 |
|
1573 |
300 continue |
1574 |
|
1575 |
c-----flux calculations |
1576 |
|
1577 |
call cldflx (m,n,np,ict,icb,cc,rr,tt,td,rs,ts, |
1578 |
* fclr,fall,fsdir,fsdif) |
1579 |
|
1580 |
do k= 1, np+1 |
1581 |
do j= 1, n |
1582 |
do i= 1, m |
1583 |
flx(i,j,k) = flx(i,j,k)+fall(i,j,k)*hk(ib,ik) |
1584 |
enddo |
1585 |
enddo |
1586 |
do j= 1, n |
1587 |
do i= 1, m |
1588 |
flc(i,j,k) = flc(i,j,k)+fclr(i,j,k)*hk(ib,ik) |
1589 |
enddo |
1590 |
enddo |
1591 |
enddo |
1592 |
|
1593 |
do j= 1, n |
1594 |
do i= 1, m |
1595 |
fdirir(i,j) = fdirir(i,j)+fsdir(i,j)*hk(ib,ik) |
1596 |
fdifir(i,j) = fdifir(i,j)+fsdif(i,j)*hk(ib,ik) |
1597 |
enddo |
1598 |
enddo |
1599 |
|
1600 |
200 continue |
1601 |
100 continue |
1602 |
|
1603 |
return |
1604 |
end |
1605 |
|
1606 |
c************************************************************************ |
1607 |
|
1608 |
subroutine soluv (m,n,ndim,np,oh,dp,taucld,tauclb,tauclf,reff, |
1609 |
* ict,icb,fcld,cc,taual,csm,rsuvbm,rsuvdf,flx,flc |
1610 |
* ,fdirpar,fdifpar,fdiruv,fdifuv) |
1611 |
|
1612 |
c************************************************************************ |
1613 |
c compute solar fluxes in the uv+visible region. the spectrum is |
1614 |
c grouped into 8 bands: |
1615 |
c |
1616 |
c Band Micrometer |
1617 |
c |
1618 |
c UV-C 1. .175 - .225 |
1619 |
c 2. .225 - .245 |
1620 |
c .260 - .280 |
1621 |
c 3. .245 - .260 |
1622 |
c |
1623 |
c UV-B 4. .280 - .295 |
1624 |
c 5. .295 - .310 |
1625 |
c 6. .310 - .320 |
1626 |
c |
1627 |
c UV-A 7. .320 - .400 |
1628 |
c |
1629 |
c PAR 8. .400 - .700 |
1630 |
c |
1631 |
c----- Input parameters: units size |
1632 |
c |
1633 |
c number of soundings in zonal direction (m) n/d 1 |
1634 |
c number of soundings in meridional direction (n) n/d 1 |
1635 |
c maximum number of soundings in n/d 1 |
1636 |
c meridional direction (ndim) |
1637 |
c number of atmospheric layers (np) n/d 1 |
1638 |
c layer ozone content (oh) (cm-atm)stp m*n*np |
1639 |
c layer pressure thickness (dp) mb m*n*np |
1640 |
c cloud optical thickness (taucld) n/d m*ndim*np*2 |
1641 |
c index 1 for ice paticles |
1642 |
c index 2 for liquid particles |
1643 |
c scaled cloud optical thickness n/d m*n*np |
1644 |
c for beam radiation (tauclb) |
1645 |
c scaled cloud optical thickness n/d m*n*np |
1646 |
c for diffuse radiation (tauclf) |
1647 |
c effective cloud-particle size (reff) micrometer m*ndim*np*2 |
1648 |
c index 1 for ice paticles |
1649 |
c index 2 for liquid particles |
1650 |
c level indiex separating high and n/d m*n |
1651 |
c middle clouds (ict) |
1652 |
c level indiex separating middle and n/d m*n |
1653 |
c low clouds (icb) |
1654 |
c cloud amount (fcld) fraction m*ndim*np |
1655 |
c cloud amounts of high, middle, and n/d m*n*3 |
1656 |
c low clouds (cc) |
1657 |
c aerosol optical thickness (taual) n/d m*ndim*np |
1658 |
c cosecant of the solar zenith angle (csm) n/d m*n |
1659 |
c uv+par surface albedo for beam fraction m*ndim |
1660 |
c radiation (rsuvbm) |
1661 |
c uv+par surface albedo for diffuse fraction m*ndim |
1662 |
c radiation (rsuvdf) |
1663 |
c |
1664 |
c----- output (updated) parameters: |
1665 |
c |
1666 |
c all-sky net downward flux (flx) fraction m*ndim*(np+1) |
1667 |
c clear-sky net downward flux (flc) fraction m*ndim*(np+1) |
1668 |
c all-sky direct downward par flux at |
1669 |
c the surface (fdirpar) fraction m*ndim |
1670 |
c all-sky diffuse downward par flux at |
1671 |
c the surface (fdifpar) fraction m*ndim |
1672 |
c |
1673 |
c----- note: the following parameters must be specified by users: |
1674 |
c |
1675 |
c aerosol single scattering albedo (ssaal) n/d 1 |
1676 |
c aerosol asymmetry factor (asyal) n/d 1 |
1677 |
c |
1678 |
* |
1679 |
c*********************************************************************** |
1680 |
|
1681 |
implicit none |
1682 |
|
1683 |
c-----Explicit Inline Directives |
1684 |
|
1685 |
#if CRAY |
1686 |
#if f77 |
1687 |
cfpp$ expand (deledd) |
1688 |
cfpp$ expand (sagpol) |
1689 |
#endif |
1690 |
#endif |
1691 |
|
1692 |
c-----input parameters |
1693 |
|
1694 |
integer m,n,ndim,np,ict,icb |
1695 |
real taucld(m,ndim,np,2),reff(m,ndim,np,2),fcld(m,ndim,np) |
1696 |
real tauclb(m,n,np),tauclf(m,n,np),cc(m,n,3) |
1697 |
real oh(m,n,np),dp(m,n,np),taual(m,ndim,np) |
1698 |
real rsuvbm(m,ndim),rsuvdf(m,ndim),csm(m,n) |
1699 |
|
1700 |
c-----output (updated) parameter |
1701 |
|
1702 |
real flx(m,ndim,np+1),flc(m,ndim,np+1) |
1703 |
real fdirpar(m,ndim),fdifpar(m,ndim) |
1704 |
real fdiruv(m,ndim),fdifuv(m,ndim) |
1705 |
|
1706 |
c-----static parameters |
1707 |
|
1708 |
integer nband |
1709 |
parameter (nband=8) |
1710 |
real hk(nband),xk(nband),ry(nband) |
1711 |
real asyal(nband),ssaal(nband),aig(3),awg(3) |
1712 |
|
1713 |
c-----temporary array |
1714 |
|
1715 |
integer i,j,k,ib |
1716 |
real taurs,tauoz,tausto,ssatau,asysto,tauto,ssato,asyto |
1717 |
real taux,reff1,reff2,g1,g2,asycl(m,n,np) |
1718 |
real td(m,n,np+1,2),rr(m,n,np+1,2),tt(m,n,np+1,2), |
1719 |
* rs(m,n,np+1,2),ts(m,n,np+1,2) |
1720 |
real upflux(m,n,np+1),dwflux(m,n,np+1), |
1721 |
* rssab(m,n,np+1),rabx(m,n,np+1),rsabx(m,n,np+1) |
1722 |
real fall(m,n,np+1),fclr(m,n,np+1),fsdir(m,n),fsdif(m,n) |
1723 |
real asyclt(m,n) |
1724 |
real rr1t(m,n),tt1t(m,n),td1t(m,n),rs1t(m,n),ts1t(m,n) |
1725 |
real rr2t(m,n),tt2t(m,n),td2t(m,n),rs2t(m,n),ts2t(m,n) |
1726 |
|
1727 |
c-----hk is the fractional extra-terrestrial solar flux. |
1728 |
c the sum of hk is 0.47074. |
1729 |
|
1730 |
data hk/.00057, .00367, .00083, .00417, |
1731 |
* .00600, .00556, .05913, .39081/ |
1732 |
|
1733 |
c-----xk is the ozone absorption coefficient. unit: /(cm-atm)stp |
1734 |
|
1735 |
data xk /30.47, 187.2, 301.9, 42.83, |
1736 |
* 7.09, 1.25, 0.0345, 0.0539/ |
1737 |
|
1738 |
c-----ry is the extinction coefficient for Rayleigh scattering. |
1739 |
c unit: /mb. |
1740 |
|
1741 |
data ry /.00604, .00170, .00222, .00132, |
1742 |
* .00107, .00091, .00055, .00012/ |
1743 |
|
1744 |
c-----aerosol single-scattering albedo and asymmetry factor |
1745 |
|
1746 |
data ssaal,asyal/nband*0.999,nband*0.850/ |
1747 |
|
1748 |
c-----coefficients for computing the asymmetry factor of ice clouds |
1749 |
c from asycl=aig(*,1)+aig(*,2)*reff+aig(*,3)*reff**2 |
1750 |
|
1751 |
data aig/.74625000,.00105410,-.00000264/ |
1752 |
|
1753 |
c-----coefficients for computing the asymmetry factor of liquid |
1754 |
c clouds from asycl=awg(*,1)+awg(*,2)*reff+awg(*,3)*reff**2 |
1755 |
|
1756 |
data awg/.82562000,.00529000,-.00014866/ |
1757 |
|
1758 |
c-----initialize surface reflectances and transmittances |
1759 |
|
1760 |
do j= 1, n |
1761 |
do i= 1, m |
1762 |
rr(i,j,np+1,1)=rsuvbm(i,j) |
1763 |
rr(i,j,np+1,2)=rsuvbm(i,j) |
1764 |
rs(i,j,np+1,1)=rsuvdf(i,j) |
1765 |
rs(i,j,np+1,2)=rsuvdf(i,j) |
1766 |
td(i,j,np+1,1)=0.0 |
1767 |
td(i,j,np+1,2)=0.0 |
1768 |
tt(i,j,np+1,1)=0.0 |
1769 |
tt(i,j,np+1,2)=0.0 |
1770 |
ts(i,j,np+1,1)=0.0 |
1771 |
ts(i,j,np+1,2)=0.0 |
1772 |
enddo |
1773 |
enddo |
1774 |
|
1775 |
c-----compute cloud asymmetry factor for a mixture of |
1776 |
c liquid and ice particles. unit of reff is micrometers. |
1777 |
|
1778 |
do k= 1, np |
1779 |
|
1780 |
do j= 1, n |
1781 |
do i= 1, m |
1782 |
|
1783 |
asyclt(i,j)=1.0 |
1784 |
|
1785 |
taux=taucld(i,j,k,1)+taucld(i,j,k,2) |
1786 |
if (taux.gt.0.05 .and. fcld(i,j,k).gt.0.01) then |
1787 |
|
1788 |
reff1=min(reff(i,j,k,1),130.) |
1789 |
reff2=min(reff(i,j,k,2),20.0) |
1790 |
|
1791 |
g1=(aig(1)+(aig(2)+aig(3)*reff1)*reff1)*taucld(i,j,k,1) |
1792 |
g2=(awg(1)+(awg(2)+awg(3)*reff2)*reff2)*taucld(i,j,k,2) |
1793 |
asyclt(i,j)=(g1+g2)/taux |
1794 |
|
1795 |
endif |
1796 |
|
1797 |
enddo |
1798 |
enddo |
1799 |
|
1800 |
do j=1,n |
1801 |
do i=1,m |
1802 |
asycl(i,j,k)=asyclt(i,j) |
1803 |
enddo |
1804 |
enddo |
1805 |
|
1806 |
enddo |
1807 |
|
1808 |
do j=1,n |
1809 |
do i=1,m |
1810 |
fdiruv(i,j)=0.0 |
1811 |
fdifuv(i,j)=0.0 |
1812 |
enddo |
1813 |
enddo |
1814 |
|
1815 |
c-----integration over spectral bands |
1816 |
|
1817 |
do 100 ib=1,nband |
1818 |
|
1819 |
do 300 k= 1, np |
1820 |
|
1821 |
do j= 1, n |
1822 |
do i= 1, m |
1823 |
|
1824 |
c-----compute ozone and rayleigh optical thicknesses |
1825 |
|
1826 |
taurs=ry(ib)*dp(i,j,k) |
1827 |
tauoz=xk(ib)*oh(i,j,k) |
1828 |
|
1829 |
c-----compute total optical thickness, single scattering albedo, |
1830 |
c and asymmetry factor |
1831 |
|
1832 |
tausto=taurs+tauoz+taual(i,j,k)+1.0e-8 |
1833 |
ssatau=ssaal(ib)*taual(i,j,k)+taurs |
1834 |
asysto=asyal(ib)*ssaal(ib)*taual(i,j,k) |
1835 |
|
1836 |
c-----compute reflectance and transmittance for cloudless layers |
1837 |
|
1838 |
tauto=tausto |
1839 |
ssato=ssatau/tauto+1.0e-8 |
1840 |
ssato=min(ssato,0.999999) |
1841 |
asyto=asysto/(ssato*tauto) |
1842 |
|
1843 |
call deledd(tauto,ssato,asyto,csm(i,j), |
1844 |
* rr1t(i,j),tt1t(i,j),td1t(i,j)) |
1845 |
|
1846 |
call sagpol (tauto,ssato,asyto,rs1t(i,j),ts1t(i,j)) |
1847 |
|
1848 |
c-----compute reflectance and transmittance for cloud layers |
1849 |
|
1850 |
if (tauclb(i,j,k) .lt. 0.01) then |
1851 |
|
1852 |
rr2t(i,j)=rr1t(i,j) |
1853 |
tt2t(i,j)=tt1t(i,j) |
1854 |
td2t(i,j)=td1t(i,j) |
1855 |
rs2t(i,j)=rs1t(i,j) |
1856 |
ts2t(i,j)=ts1t(i,j) |
1857 |
|
1858 |
else |
1859 |
|
1860 |
tauto=tausto+tauclb(i,j,k) |
1861 |
ssato=(ssatau+tauclb(i,j,k))/tauto+1.0e-8 |
1862 |
ssato=min(ssato,0.999999) |
1863 |
asyto=(asysto+asycl(i,j,k)*tauclb(i,j,k))/(ssato*tauto) |
1864 |
|
1865 |
call deledd(tauto,ssato,asyto,csm(i,j), |
1866 |
* rr2t(i,j),tt2t(i,j),td2t(i,j)) |
1867 |
|
1868 |
tauto=tausto+tauclf(i,j,k) |
1869 |
ssato=(ssatau+tauclf(i,j,k))/tauto+1.0e-8 |
1870 |
ssato=min(ssato,0.999999) |
1871 |
asyto=(asysto+asycl(i,j,k)*tauclf(i,j,k))/(ssato*tauto) |
1872 |
|
1873 |
call sagpol (tauto,ssato,asyto,rs2t(i,j),ts2t(i,j)) |
1874 |
|
1875 |
endif |
1876 |
|
1877 |
enddo |
1878 |
enddo |
1879 |
|
1880 |
do j=1,n |
1881 |
do i=1,m |
1882 |
rr(i,j,k,1)=rr1t(i,j) |
1883 |
enddo |
1884 |
enddo |
1885 |
do j=1,n |
1886 |
do i=1,m |
1887 |
tt(i,j,k,1)=tt1t(i,j) |
1888 |
enddo |
1889 |
enddo |
1890 |
do j=1,n |
1891 |
do i=1,m |
1892 |
td(i,j,k,1)=td1t(i,j) |
1893 |
enddo |
1894 |
enddo |
1895 |
do j=1,n |
1896 |
do i=1,m |
1897 |
rs(i,j,k,1)=rs1t(i,j) |
1898 |
enddo |
1899 |
enddo |
1900 |
do j=1,n |
1901 |
do i=1,m |
1902 |
ts(i,j,k,1)=ts1t(i,j) |
1903 |
enddo |
1904 |
enddo |
1905 |
|
1906 |
do j=1,n |
1907 |
do i=1,m |
1908 |
rr(i,j,k,2)=rr2t(i,j) |
1909 |
enddo |
1910 |
enddo |
1911 |
do j=1,n |
1912 |
do i=1,m |
1913 |
tt(i,j,k,2)=tt2t(i,j) |
1914 |
enddo |
1915 |
enddo |
1916 |
do j=1,n |
1917 |
do i=1,m |
1918 |
td(i,j,k,2)=td2t(i,j) |
1919 |
enddo |
1920 |
enddo |
1921 |
do j=1,n |
1922 |
do i=1,m |
1923 |
rs(i,j,k,2)=rs2t(i,j) |
1924 |
enddo |
1925 |
enddo |
1926 |
do j=1,n |
1927 |
do i=1,m |
1928 |
ts(i,j,k,2)=ts2t(i,j) |
1929 |
enddo |
1930 |
enddo |
1931 |
|
1932 |
300 continue |
1933 |
|
1934 |
c-----flux calculations |
1935 |
|
1936 |
call cldflx (m,n,np,ict,icb,cc,rr,tt,td,rs,ts, |
1937 |
* fclr,fall,fsdir,fsdif) |
1938 |
|
1939 |
do k= 1, np+1 |
1940 |
do j= 1, n |
1941 |
do i= 1, m |
1942 |
flx(i,j,k)=flx(i,j,k)+fall(i,j,k)*hk(ib) |
1943 |
enddo |
1944 |
enddo |
1945 |
do j= 1, n |
1946 |
do i= 1, m |
1947 |
flc(i,j,k)=flc(i,j,k)+fclr(i,j,k)*hk(ib) |
1948 |
enddo |
1949 |
enddo |
1950 |
enddo |
1951 |
|
1952 |
if(ib.eq.nband) then |
1953 |
do j=1,n |
1954 |
do i=1,m |
1955 |
fdirpar(i,j)=fsdir(i,j)*hk(ib) |
1956 |
fdifpar(i,j)=fsdif(i,j)*hk(ib) |
1957 |
enddo |
1958 |
enddo |
1959 |
else |
1960 |
do j=1,n |
1961 |
do i=1,m |
1962 |
fdiruv(i,j)=fdiruv(i,j)+fsdir(i,j)*hk(ib) |
1963 |
fdifuv(i,j)=fdifuv(i,j)+fsdif(i,j)*hk(ib) |
1964 |
enddo |
1965 |
enddo |
1966 |
endif |
1967 |
|
1968 |
100 continue |
1969 |
|
1970 |
return |
1971 |
end |
1972 |
|
1973 |
c********************************************************************* |
1974 |
|
1975 |
subroutine deledd(tau,ssc,g0,csm,rr,tt,td) |
1976 |
|
1977 |
c********************************************************************* |
1978 |
c |
1979 |
c-----uses the delta-eddington approximation to compute the |
1980 |
c bulk scattering properties of a single layer |
1981 |
c coded following King and Harshvardhan (JAS, 1986) |
1982 |
c |
1983 |
c inputs: |
1984 |
c |
1985 |
c tau: the effective optical thickness |
1986 |
c ssc: the effective single scattering albedo |
1987 |
c g0: the effective asymmetry factor |
1988 |
c csm: the effective secant of the zenith angle |
1989 |
c |
1990 |
c outputs: |
1991 |
c |
1992 |
c rr: the layer reflection of the direct beam |
1993 |
c tt: the layer diffuse transmission of the direct beam |
1994 |
c td: the layer direct transmission of the direct beam |
1995 |
|
1996 |
c********************************************************************* |
1997 |
|
1998 |
implicit none |
1999 |
|
2000 |
c-----Explicit Inline Directives |
2001 |
|
2002 |
#if CRAY |
2003 |
#if f77 |
2004 |
cfpp$ expand (expmn) |
2005 |
#endif |
2006 |
#endif |
2007 |
real expmn |
2008 |
|
2009 |
real zero,one,two,three,four,fourth,seven,tumin |
2010 |
parameter (one=1., three=3.) |
2011 |
parameter (seven=7., two=2.) |
2012 |
parameter (four=4., fourth=.25) |
2013 |
parameter (zero=0., tumin=1.e-20) |
2014 |
|
2015 |
c-----input parameters |
2016 |
real tau,ssc,g0,csm |
2017 |
|
2018 |
c-----output parameters |
2019 |
real rr,tt,td |
2020 |
|
2021 |
c-----temporary parameters |
2022 |
|
2023 |
real zth,ff,xx,taup,sscp,gp,gm1,gm2,gm3,akk,alf1,alf2, |
2024 |
* all,bll,st7,st8,cll,dll,fll,ell,st1,st2,st3,st4 |
2025 |
c |
2026 |
zth = one / csm |
2027 |
|
2028 |
c delta-eddington scaling of single scattering albedo, |
2029 |
c optical thickness, and asymmetry factor, |
2030 |
c K & H eqs(27-29) |
2031 |
|
2032 |
ff = g0*g0 |
2033 |
xx = one-ff*ssc |
2034 |
taup= tau*xx |
2035 |
sscp= ssc*(one-ff)/xx |
2036 |
gp = g0/(one+g0) |
2037 |
|
2038 |
c extinction of the direct beam transmission |
2039 |
|
2040 |
td = expmn(-taup*csm) |
2041 |
|
2042 |
c gamma1, gamma2, gamma3 and gamma4. see table 2 and eq(26) K & H |
2043 |
c ssc and gp are the d-s single scattering |
2044 |
c albedo and asymmetry factor. |
2045 |
|
2046 |
xx = three*gp |
2047 |
gm1 = (seven - sscp*(four+xx))*fourth |
2048 |
gm2 = -(one - sscp*(four-xx))*fourth |
2049 |
gm3 = (two - zth*xx )*fourth |
2050 |
|
2051 |
c akk is k as defined in eq(25) of K & H |
2052 |
|
2053 |
xx = gm1-gm2 |
2054 |
akk = sqrt((gm1+gm2)*xx) |
2055 |
|
2056 |
c alf1 and alf2 are alpha1 and alpha2 from eqs (23) & (24) of K & H |
2057 |
|
2058 |
alf1 = gm1 - gm3 * xx |
2059 |
alf2 = gm2 + gm3 * xx |
2060 |
|
2061 |
c all is last term in eq(21) of K & H |
2062 |
c bll is last term in eq(22) of K & H |
2063 |
|
2064 |
xx = akk * two |
2065 |
all = (gm3 - alf2 * zth )*xx*td |
2066 |
bll = (one - gm3 + alf1*zth)*xx |
2067 |
|
2068 |
xx = akk * zth |
2069 |
st7 = one - xx |
2070 |
st8 = one + xx |
2071 |
|
2072 |
xx = akk * gm3 |
2073 |
cll = (alf2 + xx) * st7 |
2074 |
dll = (alf2 - xx) * st8 |
2075 |
|
2076 |
xx = akk * (one-gm3) |
2077 |
fll = (alf1 + xx) * st8 |
2078 |
ell = (alf1 - xx) * st7 |
2079 |
|
2080 |
st3 = max(abs(st7*st8),tumin) |
2081 |
st3 = sign (st3,st7) |
2082 |
|
2083 |
st2 = expmn(-akk*taup) |
2084 |
st4 = st2 * st2 |
2085 |
|
2086 |
st1 = sscp / ((akk+gm1 + (akk-gm1)*st4) * st3) |
2087 |
|
2088 |
c rr is r-hat of eq(21) of K & H |
2089 |
c tt is diffuse part of t-hat of eq(22) of K & H |
2090 |
|
2091 |
rr = ( cll-dll*st4 -all*st2)*st1 |
2092 |
tt = - ((fll-ell*st4)*td-bll*st2)*st1 |
2093 |
|
2094 |
rr = max(rr,zero) |
2095 |
tt = max(tt,zero) |
2096 |
|
2097 |
return |
2098 |
end |
2099 |
|
2100 |
c********************************************************************* |
2101 |
|
2102 |
subroutine sagpol(tau,ssc,g0,rll,tll) |
2103 |
|
2104 |
c********************************************************************* |
2105 |
c-----transmittance (tll) and reflectance (rll) of diffuse radiation |
2106 |
c follows Sagan and Pollock (JGR, 1967). |
2107 |
c also, eq.(31) of Lacis and Hansen (JAS, 1974). |
2108 |
c |
2109 |
c-----input parameters: |
2110 |
c |
2111 |
c tau: the effective optical thickness |
2112 |
c ssc: the effective single scattering albedo |
2113 |
c g0: the effective asymmetry factor |
2114 |
c |
2115 |
c-----output parameters: |
2116 |
c |
2117 |
c rll: the layer reflection of diffuse radiation |
2118 |
c tll: the layer transmission of diffuse radiation |
2119 |
c |
2120 |
c********************************************************************* |
2121 |
|
2122 |
implicit none |
2123 |
|
2124 |
c-----Explicit Inline Directives |
2125 |
|
2126 |
#if CRAY |
2127 |
#if f77 |
2128 |
cfpp$ expand (expmn) |
2129 |
#endif |
2130 |
#endif |
2131 |
real expmn |
2132 |
|
2133 |
real one,three,four |
2134 |
parameter (one=1., three=3., four=4.) |
2135 |
|
2136 |
c-----output parameters: |
2137 |
|
2138 |
real tau,ssc,g0 |
2139 |
|
2140 |
c-----output parameters: |
2141 |
|
2142 |
real rll,tll |
2143 |
|
2144 |
c-----temporary arrays |
2145 |
|
2146 |
real xx,uuu,ttt,emt,up1,um1,st1 |
2147 |
|
2148 |
xx = one-ssc*g0 |
2149 |
uuu = sqrt( xx/(one-ssc)) |
2150 |
ttt = sqrt( xx*(one-ssc)*three )*tau |
2151 |
emt = expmn(-ttt) |
2152 |
up1 = uuu + one |
2153 |
um1 = uuu - one |
2154 |
xx = um1*emt |
2155 |
st1 = one / ((up1+xx) * (up1-xx)) |
2156 |
rll = up1*um1*(one-emt*emt)*st1 |
2157 |
tll = uuu*four*emt *st1 |
2158 |
|
2159 |
return |
2160 |
end |
2161 |
|
2162 |
c******************************************************************* |
2163 |
|
2164 |
function expmn(fin) |
2165 |
|
2166 |
c******************************************************************* |
2167 |
c compute exponential for arguments in the range 0> fin > -10. |
2168 |
|
2169 |
parameter (one=1.0, expmin=-10.0) |
2170 |
parameter (e1=1.0, e2=-2.507213e-1) |
2171 |
parameter (e3=2.92732e-2, e4=-3.827800e-3) |
2172 |
real fin,expmn |
2173 |
|
2174 |
if (fin .lt. expmin) fin = expmin |
2175 |
expmn = ((e4*fin + e3)*fin+e2)*fin+e1 |
2176 |
expmn = expmn * expmn |
2177 |
expmn = one / (expmn * expmn) |
2178 |
|
2179 |
return |
2180 |
end |
2181 |
|
2182 |
c******************************************************************* |
2183 |
|
2184 |
subroutine cldflx (m,n,np,ict,icb,cc,rr,tt,td,rs,ts, |
2185 |
* fclr,fall,fsdir,fsdif) |
2186 |
|
2187 |
c******************************************************************* |
2188 |
c compute upward and downward fluxes using a two-stream adding method |
2189 |
c following equations (3)-(5) of Chou (1992, JAS). |
2190 |
c |
2191 |
c clouds are grouped into high, middle, and low clouds which are |
2192 |
c assumed randomly overlapped. It involves eight sets of calculations. |
2193 |
c In each set of calculations, each atmospheric layer is homogeneous, |
2194 |
c either with clouds or without clouds. |
2195 |
|
2196 |
c input parameters: |
2197 |
c m: number of soundings in zonal direction |
2198 |
c n: number of soundings in meridional direction |
2199 |
c np: number of atmospheric layers |
2200 |
c ict: the level separating high and middle clouds |
2201 |
c icb: the level separating middle and low clouds |
2202 |
c cc: effective cloud covers for high, middle and low clouds |
2203 |
c tt: diffuse transmission of a layer illuminated by beam radiation |
2204 |
c td: direct beam tranmssion |
2205 |
c ts: transmission of a layer illuminated by diffuse radiation |
2206 |
c rr: reflection of a layer illuminated by beam radiation |
2207 |
c rs: reflection of a layer illuminated by diffuse radiation |
2208 |
c |
2209 |
c output parameters: |
2210 |
c fclr: clear-sky flux (downward minus upward) |
2211 |
c fall: all-sky flux (downward minus upward) |
2212 |
c fdndir: surface direct downward flux |
2213 |
c fdndif: surface diffuse downward flux |
2214 |
c*********************************************************************c |
2215 |
|
2216 |
implicit none |
2217 |
|
2218 |
c-----input parameters |
2219 |
|
2220 |
integer m,n,np,ict,icb |
2221 |
|
2222 |
real rr(m,n,np+1,2),tt(m,n,np+1,2),td(m,n,np+1,2) |
2223 |
real rs(m,n,np+1,2),ts(m,n,np+1,2) |
2224 |
real cc(m,n,3) |
2225 |
|
2226 |
c-----temporary array |
2227 |
|
2228 |
integer i,j,k,ih,im,is |
2229 |
real rra(m,n,np+1,2,2),tta(m,n,np+1,2,2),tda(m,n,np+1,2,2) |
2230 |
real rsa(m,n,np+1,2,2),rxa(m,n,np+1,2,2) |
2231 |
real ch(m,n),cm(m,n),ct(m,n),flxdn(m,n,np+1) |
2232 |
real fdndir(m,n),fdndif(m,n),fupdif |
2233 |
real denm,xx |
2234 |
|
2235 |
c-----output parameters |
2236 |
|
2237 |
real fclr(m,n,np+1),fall(m,n,np+1) |
2238 |
real fsdir(m,n),fsdif(m,n) |
2239 |
|
2240 |
c-----initialize all-sky flux (fall) and surface downward fluxes |
2241 |
|
2242 |
do k=1,np+1 |
2243 |
do j=1,n |
2244 |
do i=1,m |
2245 |
fall(i,j,k)=0.0 |
2246 |
enddo |
2247 |
enddo |
2248 |
enddo |
2249 |
|
2250 |
do j=1,n |
2251 |
do i=1,m |
2252 |
fsdir(i,j)=0.0 |
2253 |
fsdif(i,j)=0.0 |
2254 |
enddo |
2255 |
enddo |
2256 |
|
2257 |
c-----compute transmittances and reflectances for a composite of |
2258 |
c layers. layers are added one at a time, going down from the top. |
2259 |
c tda is the composite transmittance illuminated by beam radiation |
2260 |
c tta is the composite diffuse transmittance illuminated by |
2261 |
c beam radiation |
2262 |
c rsa is the composite reflectance illuminated from below |
2263 |
c by diffuse radiation |
2264 |
c tta and rsa are computed from eqs. (4b) and (3b) of Chou |
2265 |
|
2266 |
c-----for high clouds. indices 1 and 2 denote clear and cloudy |
2267 |
c situations, respectively. |
2268 |
|
2269 |
do 10 ih=1,2 |
2270 |
|
2271 |
do j= 1, n |
2272 |
do i= 1, m |
2273 |
tda(i,j,1,ih,1)=td(i,j,1,ih) |
2274 |
tta(i,j,1,ih,1)=tt(i,j,1,ih) |
2275 |
rsa(i,j,1,ih,1)=rs(i,j,1,ih) |
2276 |
tda(i,j,1,ih,2)=td(i,j,1,ih) |
2277 |
tta(i,j,1,ih,2)=tt(i,j,1,ih) |
2278 |
rsa(i,j,1,ih,2)=rs(i,j,1,ih) |
2279 |
enddo |
2280 |
enddo |
2281 |
|
2282 |
do k= 2, ict-1 |
2283 |
do j= 1, n |
2284 |
do i= 1, m |
2285 |
denm = ts(i,j,k,ih)/( 1.-rsa(i,j,k-1,ih,1)*rs(i,j,k,ih)) |
2286 |
tda(i,j,k,ih,1)= tda(i,j,k-1,ih,1)*td(i,j,k,ih) |
2287 |
tta(i,j,k,ih,1)= tda(i,j,k-1,ih,1)*tt(i,j,k,ih) |
2288 |
* +(tda(i,j,k-1,ih,1)*rr(i,j,k,ih) |
2289 |
* *rsa(i,j,k-1,ih,1)+tta(i,j,k-1,ih,1))*denm |
2290 |
rsa(i,j,k,ih,1)= rs(i,j,k,ih)+ts(i,j,k,ih) |
2291 |
* *rsa(i,j,k-1,ih,1)*denm |
2292 |
tda(i,j,k,ih,2)= tda(i,j,k,ih,1) |
2293 |
tta(i,j,k,ih,2)= tta(i,j,k,ih,1) |
2294 |
rsa(i,j,k,ih,2)= rsa(i,j,k,ih,1) |
2295 |
enddo |
2296 |
enddo |
2297 |
enddo |
2298 |
|
2299 |
c-----for middle clouds |
2300 |
|
2301 |
do 10 im=1,2 |
2302 |
|
2303 |
do k= ict, icb-1 |
2304 |
do j= 1, n |
2305 |
do i= 1, m |
2306 |
denm = ts(i,j,k,im)/( 1.-rsa(i,j,k-1,ih,im)*rs(i,j,k,im)) |
2307 |
tda(i,j,k,ih,im)= tda(i,j,k-1,ih,im)*td(i,j,k,im) |
2308 |
tta(i,j,k,ih,im)= tda(i,j,k-1,ih,im)*tt(i,j,k,im) |
2309 |
* +(tda(i,j,k-1,ih,im)*rr(i,j,k,im) |
2310 |
* *rsa(i,j,k-1,ih,im)+tta(i,j,k-1,ih,im))*denm |
2311 |
rsa(i,j,k,ih,im)= rs(i,j,k,im)+ts(i,j,k,im) |
2312 |
* *rsa(i,j,k-1,ih,im)*denm |
2313 |
enddo |
2314 |
enddo |
2315 |
enddo |
2316 |
|
2317 |
10 continue |
2318 |
|
2319 |
c-----layers are added one at a time, going up from the surface. |
2320 |
c rra is the composite reflectance illuminated by beam radiation |
2321 |
c rxa is the composite reflectance illuminated from above |
2322 |
c by diffuse radiation |
2323 |
c rra and rxa are computed from eqs. (4a) and (3a) of Chou |
2324 |
|
2325 |
c-----for the low clouds |
2326 |
|
2327 |
do 20 is=1,2 |
2328 |
|
2329 |
do j= 1, n |
2330 |
do i= 1, m |
2331 |
rra(i,j,np+1,1,is)=rr(i,j,np+1,is) |
2332 |
rxa(i,j,np+1,1,is)=rs(i,j,np+1,is) |
2333 |
rra(i,j,np+1,2,is)=rr(i,j,np+1,is) |
2334 |
rxa(i,j,np+1,2,is)=rs(i,j,np+1,is) |
2335 |
enddo |
2336 |
enddo |
2337 |
|
2338 |
do k=np,icb,-1 |
2339 |
do j= 1, n |
2340 |
do i= 1, m |
2341 |
denm=ts(i,j,k,is)/( 1.-rs(i,j,k,is)*rxa(i,j,k+1,1,is) ) |
2342 |
rra(i,j,k,1,is)=rr(i,j,k,is)+(td(i,j,k,is) |
2343 |
* *rra(i,j,k+1,1,is)+tt(i,j,k,is)*rxa(i,j,k+1,1,is))*denm |
2344 |
rxa(i,j,k,1,is)= rs(i,j,k,is)+ts(i,j,k,is) |
2345 |
* *rxa(i,j,k+1,1,is)*denm |
2346 |
rra(i,j,k,2,is)=rra(i,j,k,1,is) |
2347 |
rxa(i,j,k,2,is)=rxa(i,j,k,1,is) |
2348 |
enddo |
2349 |
enddo |
2350 |
enddo |
2351 |
|
2352 |
c-----for middle clouds |
2353 |
|
2354 |
do 20 im=1,2 |
2355 |
|
2356 |
do k= icb-1,ict,-1 |
2357 |
do j= 1, n |
2358 |
do i= 1, m |
2359 |
denm=ts(i,j,k,im)/( 1.-rs(i,j,k,im)*rxa(i,j,k+1,im,is) ) |
2360 |
rra(i,j,k,im,is)= rr(i,j,k,im)+(td(i,j,k,im) |
2361 |
* *rra(i,j,k+1,im,is)+tt(i,j,k,im)*rxa(i,j,k+1,im,is))*denm |
2362 |
rxa(i,j,k,im,is)= rs(i,j,k,im)+ts(i,j,k,im) |
2363 |
* *rxa(i,j,k+1,im,is)*denm |
2364 |
enddo |
2365 |
enddo |
2366 |
enddo |
2367 |
|
2368 |
20 continue |
2369 |
|
2370 |
c-----integration over eight sky situations. |
2371 |
c ih, im, is denotes high, middle and low cloud groups. |
2372 |
|
2373 |
do 100 ih=1,2 |
2374 |
|
2375 |
c-----clear portion |
2376 |
|
2377 |
if(ih.eq.1) then |
2378 |
do j=1,n |
2379 |
do i=1,m |
2380 |
ch(i,j)=1.0-cc(i,j,1) |
2381 |
enddo |
2382 |
enddo |
2383 |
|
2384 |
else |
2385 |
|
2386 |
c-----cloudy portion |
2387 |
|
2388 |
do j=1,n |
2389 |
do i=1,m |
2390 |
ch(i,j)=cc(i,j,1) |
2391 |
enddo |
2392 |
enddo |
2393 |
|
2394 |
endif |
2395 |
|
2396 |
do 100 im=1,2 |
2397 |
|
2398 |
c-----clear portion |
2399 |
|
2400 |
if(im.eq.1) then |
2401 |
|
2402 |
do j=1,n |
2403 |
do i=1,m |
2404 |
cm(i,j)=ch(i,j)*(1.0-cc(i,j,2)) |
2405 |
enddo |
2406 |
enddo |
2407 |
|
2408 |
else |
2409 |
|
2410 |
c-----cloudy portion |
2411 |
|
2412 |
do j=1,n |
2413 |
do i=1,m |
2414 |
cm(i,j)=ch(i,j)*cc(i,j,2) |
2415 |
enddo |
2416 |
enddo |
2417 |
|
2418 |
endif |
2419 |
|
2420 |
do 100 is=1,2 |
2421 |
|
2422 |
c-----clear portion |
2423 |
|
2424 |
if(is.eq.1) then |
2425 |
|
2426 |
do j=1,n |
2427 |
do i=1,m |
2428 |
ct(i,j)=cm(i,j)*(1.0-cc(i,j,3)) |
2429 |
enddo |
2430 |
enddo |
2431 |
|
2432 |
else |
2433 |
|
2434 |
c-----cloudy portion |
2435 |
|
2436 |
do j=1,n |
2437 |
do i=1,m |
2438 |
ct(i,j)=cm(i,j)*cc(i,j,3) |
2439 |
enddo |
2440 |
enddo |
2441 |
|
2442 |
endif |
2443 |
|
2444 |
c-----add one layer at a time, going down. |
2445 |
|
2446 |
do k= icb, np |
2447 |
do j= 1, n |
2448 |
do i= 1, m |
2449 |
denm = ts(i,j,k,is)/( 1.-rsa(i,j,k-1,ih,im)*rs(i,j,k,is) ) |
2450 |
tda(i,j,k,ih,im)= tda(i,j,k-1,ih,im)*td(i,j,k,is) |
2451 |
tta(i,j,k,ih,im)= tda(i,j,k-1,ih,im)*tt(i,j,k,is) |
2452 |
* +(tda(i,j,k-1,ih,im)*rr(i,j,k,is) |
2453 |
* *rsa(i,j,k-1,ih,im)+tta(i,j,k-1,ih,im))*denm |
2454 |
rsa(i,j,k,ih,im)= rs(i,j,k,is)+ts(i,j,k,is) |
2455 |
* *rsa(i,j,k-1,ih,im)*denm |
2456 |
enddo |
2457 |
enddo |
2458 |
enddo |
2459 |
|
2460 |
c-----add one layer at a time, going up. |
2461 |
|
2462 |
do k= ict-1,1,-1 |
2463 |
do j= 1, n |
2464 |
do i= 1, m |
2465 |
denm =ts(i,j,k,ih)/(1.-rs(i,j,k,ih)*rxa(i,j,k+1,im,is)) |
2466 |
rra(i,j,k,im,is)= rr(i,j,k,ih)+(td(i,j,k,ih) |
2467 |
* *rra(i,j,k+1,im,is)+tt(i,j,k,ih)*rxa(i,j,k+1,im,is))*denm |
2468 |
rxa(i,j,k,im,is)= rs(i,j,k,ih)+ts(i,j,k,ih) |
2469 |
* *rxa(i,j,k+1,im,is)*denm |
2470 |
enddo |
2471 |
enddo |
2472 |
enddo |
2473 |
|
2474 |
c-----compute fluxes following eq (5) of Chou (1992) |
2475 |
|
2476 |
c fdndir is the direct downward flux |
2477 |
c fdndif is the diffuse downward flux |
2478 |
c fupdif is the diffuse upward flux |
2479 |
|
2480 |
do k=2,np+1 |
2481 |
do j=1, n |
2482 |
do i=1, m |
2483 |
denm= 1./(1.- rxa(i,j,k,im,is)*rsa(i,j,k-1,ih,im)) |
2484 |
fdndir(i,j)= tda(i,j,k-1,ih,im) |
2485 |
xx = tda(i,j,k-1,ih,im)*rra(i,j,k,im,is) |
2486 |
fdndif(i,j)= (xx*rsa(i,j,k-1,ih,im)+tta(i,j,k-1,ih,im))*denm |
2487 |
fupdif= (xx+tta(i,j,k-1,ih,im)*rxa(i,j,k,im,is))*denm |
2488 |
flxdn(i,j,k)=fdndir(i,j)+fdndif(i,j)-fupdif |
2489 |
enddo |
2490 |
enddo |
2491 |
enddo |
2492 |
|
2493 |
do j=1, n |
2494 |
do i=1, m |
2495 |
flxdn(i,j,1)=1.0-rra(i,j,1,im,is) |
2496 |
enddo |
2497 |
enddo |
2498 |
|
2499 |
c-----summation of fluxes over all (eight) sky situations. |
2500 |
|
2501 |
do k=1,np+1 |
2502 |
do j=1,n |
2503 |
do i=1,m |
2504 |
if(ih.eq.1 .and. im.eq.1 .and. is.eq.1) then |
2505 |
fclr(i,j,k)=flxdn(i,j,k) |
2506 |
endif |
2507 |
fall(i,j,k)=fall(i,j,k)+flxdn(i,j,k)*ct(i,j) |
2508 |
enddo |
2509 |
enddo |
2510 |
enddo |
2511 |
|
2512 |
do j=1,n |
2513 |
do i=1,m |
2514 |
fsdir(i,j)=fsdir(i,j)+fdndir(i,j)*ct(i,j) |
2515 |
fsdif(i,j)=fsdif(i,j)+fdndif(i,j)*ct(i,j) |
2516 |
enddo |
2517 |
enddo |
2518 |
|
2519 |
100 continue |
2520 |
|
2521 |
return |
2522 |
end |
2523 |
|
2524 |
c***************************************************************** |
2525 |
|
2526 |
subroutine flxco2(m,n,np,swc,swh,csm,df) |
2527 |
|
2528 |
c***************************************************************** |
2529 |
|
2530 |
c-----compute the reduction of clear-sky downward solar flux |
2531 |
c due to co2 absorption. |
2532 |
|
2533 |
implicit none |
2534 |
|
2535 |
c-----input parameters |
2536 |
|
2537 |
integer m,n,np |
2538 |
real csm(m,n),swc(m,n,np+1),swh(m,n,np+1),cah(22,19) |
2539 |
|
2540 |
c-----output (undated) parameter |
2541 |
|
2542 |
real df(m,n,np+1) |
2543 |
|
2544 |
c-----temporary array |
2545 |
|
2546 |
integer i,j,k,ic,iw |
2547 |
real xx,clog,wlog,dc,dw,x1,x2,y2 |
2548 |
|
2549 |
c******************************************************************** |
2550 |
c-----include co2 look-up table |
2551 |
|
2552 |
include 'cah.dat' |
2553 |
save cah |
2554 |
|
2555 |
c******************************************************************** |
2556 |
c-----table look-up for the reduction of clear-sky solar |
2557 |
c radiation due to co2. The fraction 0.0343 is the |
2558 |
c extraterrestrial solar flux in the co2 bands. |
2559 |
|
2560 |
do k= 2, np+1 |
2561 |
do j= 1, n |
2562 |
do i= 1, m |
2563 |
xx=1./.3 |
2564 |
clog=log10(swc(i,j,k)*csm(i,j)) |
2565 |
wlog=log10(swh(i,j,k)*csm(i,j)) |
2566 |
ic=int( (clog+3.15)*xx+1.) |
2567 |
iw=int( (wlog+4.15)*xx+1.) |
2568 |
if(ic.lt.2)ic=2 |
2569 |
if(iw.lt.2)iw=2 |
2570 |
if(ic.gt.22)ic=22 |
2571 |
if(iw.gt.19)iw=19 |
2572 |
dc=clog-float(ic-2)*.3+3. |
2573 |
dw=wlog-float(iw-2)*.3+4. |
2574 |
x1=cah(1,iw-1)+(cah(1,iw)-cah(1,iw-1))*xx*dw |
2575 |
x2=cah(ic-1,iw-1)+(cah(ic-1,iw)-cah(ic-1,iw-1))*xx*dw |
2576 |
y2=x2+(cah(ic,iw-1)-cah(ic-1,iw-1))*xx*dc |
2577 |
if (x1.lt.y2) x1=y2 |
2578 |
df(i,j,k)=df(i,j,k)+0.0343*(x1-y2) |
2579 |
enddo |
2580 |
enddo |
2581 |
enddo |
2582 |
|
2583 |
return |
2584 |
end |